diff --git a/doc/release-notes/rl-2111.adoc b/doc/release-notes/rl-2111.adoc
index 63986f95..14216eff 100644
--- a/doc/release-notes/rl-2111.adoc
+++ b/doc/release-notes/rl-2111.adoc
@@ -9,7 +9,29 @@ section is therefore not final.
 
 This release has the following notable changes:
 
-* Nothing has happened.
+* All Home Manager modules are now loaded on all platforms. With this
+change you will get a more descriptive error message if you attempt to
+enable a module that is incompatible with the host platform.
++
+Previously, modules that were platform specific would only be loaded
+on that particular platform. For example, a module defining a
+https://systemd.io/[systemd] service would only be loaded when the
+host platform was Linux. This reduced evaluation times, simplified the
+generated documentation, and made it impossible to accidentally use
+modules that do not support the host platform.
++
+While the above benefits are quite nice, avoiding module loads also
+brings a few problems. For example, the
+https://nix-community.github.io/home-manager/[public documentation]
+will only show the options available for Linux hosts and the
+documentation cannot make references to options within modules that
+are unavailable on some hosts. Finally, users who wish to use the same
+configuration file for different platforms cannot do so, even if the
+platform incompatible options are unused.
++
+Ultimately, the benefits of loading all modules won and the behavior
+has now changed. For associated discussion see
+https://github.com/nix-community/home-manager/issues/1906[issue #1906].
 
 [[sec-release-21.11-state-version-changes]]
 === State Version Changes
diff --git a/modules/config/i18n.nix b/modules/config/i18n.nix
index 9fca360d..c795bbcf 100644
--- a/modules/config/i18n.nix
+++ b/modules/config/i18n.nix
@@ -36,7 +36,7 @@ let
 in {
   meta.maintainers = with maintainers; [ midchildan ];
 
-  config = {
+  config = mkIf pkgs.hostPlatform.isLinux {
     # For shell sessions.
     home.sessionVariables = localeVars;
 
diff --git a/modules/i18n/input-method/default.nix b/modules/i18n/input-method/default.nix
index 0abfec17..27b3ae86 100644
--- a/modules/i18n/input-method/default.nix
+++ b/modules/i18n/input-method/default.nix
@@ -95,6 +95,10 @@ in {
   };
 
   config = mkIf (cfg.enabled != null) {
+    assertions = [
+      (hm.assertions.assertPlatform "i18n.inputMethod" pkgs platforms.linux)
+    ];
+
     home.packages = [ cfg.package gtk2Cache gtk3Cache ];
   };
 
diff --git a/modules/lib/assertions.nix b/modules/lib/assertions.nix
new file mode 100644
index 00000000..1089c27b
--- /dev/null
+++ b/modules/lib/assertions.nix
@@ -0,0 +1,14 @@
+{ lib }:
+
+{
+  assertPlatform = module: pkgs: platforms: {
+    assertion = lib.elem pkgs.stdenv.hostPlatform.system platforms;
+    message = let
+      platformsStr = lib.concatStringsSep "\n"
+        (map (p: "  - ${p}") (lib.sort (a: b: a < b) platforms));
+    in ''
+      The module ${module} does not support your platform. It only supports
+
+      ${platformsStr}'';
+  };
+}
diff --git a/modules/lib/default.nix b/modules/lib/default.nix
index 7c2c72f7..c087c810 100644
--- a/modules/lib/default.nix
+++ b/modules/lib/default.nix
@@ -16,6 +16,8 @@ rec {
         entryBefore = d.dagEntryBefore;
       };
 
+  assertions = import ./assertions.nix { inherit lib; };
+
   gvariant = import ./gvariant.nix { inherit lib; };
   maintainers = import ./maintainers.nix;
   strings = import ./strings.nix { inherit lib; };
diff --git a/modules/misc/numlock.nix b/modules/misc/numlock.nix
index c823f6db..88032417 100644
--- a/modules/misc/numlock.nix
+++ b/modules/misc/numlock.nix
@@ -12,6 +12,10 @@ in {
   options = { xsession.numlock.enable = mkEnableOption "Num Lock"; };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (hm.assertions.assertPlatform "xsession.numlock" pkgs platforms.linux)
+    ];
+
     systemd.user.services.numlockx = {
       Unit = {
         Description = "NumLockX";
diff --git a/modules/misc/tmpfiles.nix b/modules/misc/tmpfiles.nix
index c46fe2c5..24884302 100644
--- a/modules/misc/tmpfiles.nix
+++ b/modules/misc/tmpfiles.nix
@@ -25,6 +25,11 @@ in {
   };
 
   config = mkIf (cfg.rules != [ ]) {
+    assertions = [
+      (hm.assertions.assertPlatform "systemd.user.tmpfiles" pkgs
+        platforms.linux)
+    ];
+
     xdg = {
       dataFile."user-tmpfiles.d/home-manager.conf" = {
         text = ''
diff --git a/modules/misc/xdg-desktop-entries.nix b/modules/misc/xdg-desktop-entries.nix
index 382d6c2b..73452c07 100644
--- a/modules/misc/xdg-desktop-entries.nix
+++ b/modules/misc/xdg-desktop-entries.nix
@@ -171,8 +171,13 @@ in {
     '';
   };
 
-  config.home.packages = mkIf (config.xdg.desktopEntries != { })
-    (map hiPrio # we need hiPrio to override existing entries
+  config = mkIf (config.xdg.desktopEntries != { }) {
+    assertions = [
+      (hm.assertions.assertPlatform "xdg.desktopEntries" pkgs platforms.linux)
+    ];
+
+    home.packages = (map hiPrio # we need hiPrio to override existing entries
       (attrsets.mapAttrsToList makeFile config.xdg.desktopEntries));
+  };
 
 }
diff --git a/modules/misc/xdg-mime-apps.nix b/modules/misc/xdg-mime-apps.nix
index 81d2ba0f..c7867d44 100644
--- a/modules/misc/xdg-mime-apps.nix
+++ b/modules/misc/xdg-mime-apps.nix
@@ -73,6 +73,9 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions =
+      [ (hm.assertions.assertPlatform "xdg.mimeApps" pkgs platforms.linux) ];
+
     # Deprecated but still used by some applications.
     xdg.dataFile."applications/mimeapps.list".source =
       config.xdg.configFile."mimeapps.list".source;
diff --git a/modules/misc/xdg-mime.nix b/modules/misc/xdg-mime.nix
index 5999e129..9a6d7860 100644
--- a/modules/misc/xdg-mime.nix
+++ b/modules/misc/xdg-mime.nix
@@ -10,7 +10,9 @@ in {
   options = {
     xdg.mime.enable = mkOption {
       type = types.bool;
-      default = true;
+      default = pkgs.hostPlatform.isLinux;
+      defaultText =
+        literalExample "true if host platform is Linux, false otherwise";
       description = ''
         Whether to install programs and files to support the
         XDG Shared MIME-info specification and XDG MIME Applications
@@ -24,6 +26,9 @@ in {
   };
 
   config = mkIf config.xdg.mime.enable {
+    assertions =
+      [ (hm.assertions.assertPlatform "xdg.mime" pkgs platforms.linux) ];
+
     home.packages = [
       # Explicitly install package to provide basic mime types.
       pkgs.shared-mime-info
diff --git a/modules/misc/xdg-system-dirs.nix b/modules/misc/xdg-system-dirs.nix
index f79ebc55..87624458 100644
--- a/modules/misc/xdg-system-dirs.nix
+++ b/modules/misc/xdg-system-dirs.nix
@@ -36,6 +36,12 @@ in {
   };
 
   config = mkMerge [
+    (mkIf (cfg.config != [ ] || cfg.data != [ ]) {
+      assertions = [
+        (hm.assertions.assertPlatform "xdg.systemDirs" pkgs platforms.linux)
+      ];
+    })
+
     (mkIf (cfg.config != [ ]) {
       home.sessionVariables.XDG_CONFIG_DIRS =
         "${configDirs}\${XDG_CONFIG_DIRS:+:$XDG_CONFIG_DIRS}";
diff --git a/modules/misc/xdg-user-dirs.nix b/modules/misc/xdg-user-dirs.nix
index 6694b52d..78d350cd 100644
--- a/modules/misc/xdg-user-dirs.nix
+++ b/modules/misc/xdg-user-dirs.nix
@@ -103,6 +103,9 @@ in {
       XDG_VIDEOS_DIR = cfg.videos;
     } // cfg.extraConfig;
   in mkIf cfg.enable {
+    assertions =
+      [ (hm.assertions.assertPlatform "xdg.userDirs" pkgs platforms.linux) ];
+
     xdg.configFile."user-dirs.dirs".text = let
       # For some reason, these need to be wrapped with quotes to be valid.
       wrapped = mapAttrs (_: value: ''"${value}"'') directories;
diff --git a/modules/modules.nix b/modules/modules.nix
index 8b76f6c0..a82c3cb6 100644
--- a/modules/modules.nix
+++ b/modules/modules.nix
@@ -14,234 +14,225 @@ with lib;
 
 let
 
-  hostPlatform = pkgs.stdenv.hostPlatform;
-
-  loadModule = file: { condition ? true }: {
-    inherit file condition;
-  };
-
-  allModules = [
-    (loadModule ./accounts/email.nix { })
-    (loadModule ./config/i18n.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./files.nix { })
-    (loadModule ./home-environment.nix { })
-    (loadModule ./i18n/input-method/default.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./manual.nix { })
-    (loadModule ./misc/dconf.nix { })
-    (loadModule ./misc/debug.nix { })
-    (loadModule ./misc/fontconfig.nix { })
-    (loadModule ./misc/gtk.nix { })
-    (loadModule ./misc/lib.nix { })
-    (loadModule ./misc/news.nix { })
-    (loadModule ./misc/nixpkgs.nix { condition = useNixpkgsModule; })
-    (loadModule ./misc/numlock.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./misc/pam.nix { })
-    (loadModule ./misc/qt.nix { })
-    (loadModule ./misc/submodule-support.nix { })
-    (loadModule ./misc/tmpfiles.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./misc/version.nix { })
-    (loadModule ./misc/vte.nix { })
-    (loadModule ./misc/xdg-system-dirs.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./misc/xdg-desktop-entries.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./misc/xdg-mime.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./misc/xdg-mime-apps.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./misc/xdg-user-dirs.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./misc/xdg.nix { })
-    (loadModule ./programs/abook.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./programs/afew.nix { })
-    (loadModule ./programs/alacritty.nix { })
-    (loadModule ./programs/alot.nix { })
-    (loadModule ./programs/aria2.nix { })
-    (loadModule ./programs/astroid.nix { })
-    (loadModule ./programs/autojump.nix { })
-    (loadModule ./programs/autorandr.nix { })
-    (loadModule ./programs/bash.nix { })
-    (loadModule ./programs/bat.nix { })
-    (loadModule ./programs/beets.nix { })
-    (loadModule ./programs/broot.nix { })
-    (loadModule ./programs/browserpass.nix { })
-    (loadModule ./programs/chromium.nix { })
-    (loadModule ./programs/command-not-found/command-not-found.nix { })
-    (loadModule ./programs/dircolors.nix { })
-    (loadModule ./programs/direnv.nix { })
-    (loadModule ./programs/eclipse.nix { })
-    (loadModule ./programs/emacs.nix { })
-    (loadModule ./programs/exa.nix { })
-    (loadModule ./programs/feh.nix { })
-    (loadModule ./programs/firefox.nix { })
-    (loadModule ./programs/fish.nix { })
-    (loadModule ./programs/foot.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./programs/fzf.nix { })
-    (loadModule ./programs/getmail.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./programs/gh.nix { })
-    (loadModule ./programs/git.nix { })
-    (loadModule ./programs/gnome-terminal.nix { })
-    (loadModule ./programs/go.nix { })
-    (loadModule ./programs/gpg.nix { })
-    (loadModule ./programs/himalaya.nix { })
-    (loadModule ./programs/home-manager.nix { })
-    (loadModule ./programs/htop.nix { })
-    (loadModule ./programs/i3status.nix { })
-    (loadModule ./programs/i3status-rust.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./programs/info.nix { })
-    (loadModule ./programs/irssi.nix { })
-    (loadModule ./programs/lieer.nix { })
-    (loadModule ./programs/jq.nix { })
-    (loadModule ./programs/kakoune.nix { })
-    (loadModule ./programs/keychain.nix { })
-    (loadModule ./programs/kitty.nix { })
-    (loadModule ./programs/lazygit.nix { })
-    (loadModule ./programs/lesspipe.nix { })
-    (loadModule ./programs/lf.nix { })
-    (loadModule ./programs/lsd.nix { })
-    (loadModule ./programs/man.nix { })
-    (loadModule ./programs/mangohud.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./programs/matplotlib.nix { })
-    (loadModule ./programs/mbsync.nix { })
-    (loadModule ./programs/mcfly.nix { })
-    (loadModule ./programs/mercurial.nix { })
-    (loadModule ./programs/mpv.nix { })
-    (loadModule ./programs/msmtp.nix { })
-    (loadModule ./programs/mu.nix { })
-    (loadModule ./programs/ncmpcpp.nix { })
-    (loadModule ./programs/ncspot.nix { })
-    (loadModule ./programs/ne.nix { })
-    (loadModule ./programs/neomutt.nix { })
-    (loadModule ./programs/neovim.nix { })
-    (loadModule ./programs/newsboat.nix { })
-    (loadModule ./programs/nix-index.nix { })
-    (loadModule ./programs/noti.nix { })
-    (loadModule ./programs/notmuch.nix { })
-    (loadModule ./programs/nushell.nix { })
-    (loadModule ./programs/obs-studio.nix { })
-    (loadModule ./programs/octant.nix { })
-    (loadModule ./programs/offlineimap.nix { })
-    (loadModule ./programs/opam.nix { })
-    (loadModule ./programs/password-store.nix { })
-    (loadModule ./programs/pazi.nix { })
-    (loadModule ./programs/pet.nix { })
-    (loadModule ./programs/pidgin.nix { })
-    (loadModule ./programs/piston-cli.nix { })
-    (loadModule ./programs/powerline-go.nix { })
-    (loadModule ./programs/qutebrowser.nix { })
-    (loadModule ./programs/rbw.nix { })
-    (loadModule ./programs/readline.nix { })
-    (loadModule ./programs/rofi.nix { })
-    (loadModule ./programs/rofi-pass.nix {  })
-    (loadModule ./programs/rtorrent.nix { })
-    (loadModule ./programs/scmpuff.nix { })
-    (loadModule ./programs/senpai.nix { })
-    (loadModule ./programs/skim.nix { })
-    (loadModule ./programs/sm64ex.nix { })
-    (loadModule ./programs/starship.nix { })
-    (loadModule ./programs/sbt.nix { })
-    (loadModule ./programs/ssh.nix { })
-    (loadModule ./programs/taskwarrior.nix { })
-    (loadModule ./programs/termite.nix { })
-    (loadModule ./programs/texlive.nix { })
-    (loadModule ./programs/tmux.nix { })
-    (loadModule ./programs/terminator.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./programs/topgrade.nix { })
-    (loadModule ./programs/urxvt.nix { })
-    (loadModule ./programs/vim.nix { })
-    (loadModule ./programs/vscode.nix { })
-    (loadModule ./programs/vscode/haskell.nix { })
-    (loadModule ./programs/waybar.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./programs/xmobar.nix { })
-    (loadModule ./programs/z-lua.nix { })
-    (loadModule ./programs/zathura.nix { })
-    (loadModule ./programs/zoxide.nix { })
-    (loadModule ./programs/zplug.nix { })
-    (loadModule ./programs/zsh.nix { })
-    (loadModule ./programs/zsh/prezto.nix { })
-    (loadModule ./services/barrier.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/blueman-applet.nix { })
-    (loadModule ./services/caffeine.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/cbatticon.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/clipmenu.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/compton.nix { })
-    (loadModule ./services/devilspie2.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/dropbox.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/dunst.nix { })
-    (loadModule ./services/dwm-status.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/emacs.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/etesync-dav.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/flameshot.nix { })
-    (loadModule ./services/fluidsynth.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/redshift-gammastep/gammastep.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/getmail.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/gnome-keyring.nix { })
-    (loadModule ./services/gpg-agent.nix { })
-    (loadModule ./services/grobi.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/hound.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/imapnotify.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/kanshi.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/kbfs.nix { })
-    (loadModule ./services/kdeconnect.nix { })
-    (loadModule ./services/keepassx.nix { })
-    (loadModule ./services/keybase.nix { })
-    (loadModule ./services/keynav.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/lieer.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/lorri.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/mako.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/mbsync.nix { })
-    (loadModule ./services/mpd.nix { })
-    (loadModule ./services/mpdris2.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/mpris-proxy.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/muchsync.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/network-manager-applet.nix { })
-    (loadModule ./services/nextcloud-client.nix { })
-    (loadModule ./services/owncloud-client.nix { })
-    (loadModule ./services/pantalaimon.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/parcellite.nix { })
-    (loadModule ./services/pass-secret-service.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/password-store-sync.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/pasystray.nix { })
-    (loadModule ./services/pbgopy.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/picom.nix { })
-    (loadModule ./services/plan9port.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/playerctld.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/polybar.nix { })
-    (loadModule ./services/poweralertd.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/pulseeffects.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/random-background.nix { })
-    (loadModule ./services/redshift-gammastep/redshift.nix { })
-    (loadModule ./services/rsibreak.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/screen-locker.nix { })
-    (loadModule ./services/stalonetray.nix { })
-    (loadModule ./services/status-notifier-watcher.nix { })
-    (loadModule ./services/spotifyd.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/sxhkd.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/syncthing.nix { })
-    (loadModule ./services/taffybar.nix { })
-    (loadModule ./services/tahoe-lafs.nix { })
-    (loadModule ./services/taskwarrior-sync.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/udiskie.nix { })
-    (loadModule ./services/unclutter.nix { })
-    (loadModule ./services/unison.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/window-managers/awesome.nix { })
-    (loadModule ./services/window-managers/bspwm/default.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/window-managers/i3-sway/i3.nix { })
-    (loadModule ./services/window-managers/i3-sway/sway.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/window-managers/xmonad.nix { })
-    (loadModule ./services/wlsunset.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/xcape.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/xembed-sni-proxy.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/xidlehook.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/xscreensaver.nix { })
-    (loadModule ./services/xsettingsd.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./services/xsuspender.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./systemd.nix { })
-    (loadModule ./targets/darwin { condition = hostPlatform.isDarwin; })
-    (loadModule ./targets/generic-linux.nix { condition = hostPlatform.isLinux; })
-    (loadModule ./xcursor.nix { })
-    (loadModule ./xresources.nix { })
-    (loadModule ./xsession.nix { })
-    (loadModule (pkgs.path + "/nixos/modules/misc/assertions.nix") { })
-    (loadModule (pkgs.path + "/nixos/modules/misc/meta.nix") { })
-  ];
-
-  modules = map (getAttr "file") (filter (getAttr "condition") allModules);
+  modules = [
+    ./accounts/email.nix
+    ./config/i18n.nix
+    ./files.nix
+    ./home-environment.nix
+    ./i18n/input-method/default.nix
+    ./manual.nix
+    ./misc/dconf.nix
+    ./misc/debug.nix
+    ./misc/fontconfig.nix
+    ./misc/gtk.nix
+    ./misc/lib.nix
+    ./misc/news.nix
+    ./misc/numlock.nix
+    ./misc/pam.nix
+    ./misc/qt.nix
+    ./misc/submodule-support.nix
+    ./misc/tmpfiles.nix
+    ./misc/version.nix
+    ./misc/vte.nix
+    ./misc/xdg-desktop-entries.nix
+    ./misc/xdg-mime-apps.nix
+    ./misc/xdg-mime.nix
+    ./misc/xdg-system-dirs.nix
+    ./misc/xdg-user-dirs.nix
+    ./misc/xdg.nix
+    ./programs/abook.nix
+    ./programs/afew.nix
+    ./programs/alacritty.nix
+    ./programs/alot.nix
+    ./programs/aria2.nix
+    ./programs/astroid.nix
+    ./programs/autojump.nix
+    ./programs/autorandr.nix
+    ./programs/bash.nix
+    ./programs/bat.nix
+    ./programs/beets.nix
+    ./programs/broot.nix
+    ./programs/browserpass.nix
+    ./programs/chromium.nix
+    ./programs/command-not-found/command-not-found.nix
+    ./programs/dircolors.nix
+    ./programs/direnv.nix
+    ./programs/eclipse.nix
+    ./programs/emacs.nix
+    ./programs/exa.nix
+    ./programs/feh.nix
+    ./programs/firefox.nix
+    ./programs/fish.nix
+    ./programs/foot.nix
+    ./programs/fzf.nix
+    ./programs/getmail.nix
+    ./programs/gh.nix
+    ./programs/git.nix
+    ./programs/gnome-terminal.nix
+    ./programs/go.nix
+    ./programs/gpg.nix
+    ./programs/himalaya.nix
+    ./programs/home-manager.nix
+    ./programs/htop.nix
+    ./programs/i3status-rust.nix
+    ./programs/i3status.nix
+    ./programs/info.nix
+    ./programs/irssi.nix
+    ./programs/jq.nix
+    ./programs/kakoune.nix
+    ./programs/keychain.nix
+    ./programs/kitty.nix
+    ./programs/lazygit.nix
+    ./programs/lesspipe.nix
+    ./programs/lf.nix
+    ./programs/lieer.nix
+    ./programs/lsd.nix
+    ./programs/man.nix
+    ./programs/mangohud.nix
+    ./programs/matplotlib.nix
+    ./programs/mbsync.nix
+    ./programs/mcfly.nix
+    ./programs/mercurial.nix
+    ./programs/mpv.nix
+    ./programs/msmtp.nix
+    ./programs/mu.nix
+    ./programs/ncmpcpp.nix
+    ./programs/ncspot.nix
+    ./programs/ne.nix
+    ./programs/neomutt.nix
+    ./programs/neovim.nix
+    ./programs/newsboat.nix
+    ./programs/nix-index.nix
+    ./programs/noti.nix
+    ./programs/notmuch.nix
+    ./programs/nushell.nix
+    ./programs/obs-studio.nix
+    ./programs/octant.nix
+    ./programs/offlineimap.nix
+    ./programs/opam.nix
+    ./programs/password-store.nix
+    ./programs/pazi.nix
+    ./programs/pet.nix
+    ./programs/pidgin.nix
+    ./programs/piston-cli.nix
+    ./programs/powerline-go.nix
+    ./programs/qutebrowser.nix
+    ./programs/rbw.nix
+    ./programs/readline.nix
+    ./programs/rofi-pass.nix
+    ./programs/rofi.nix
+    ./programs/rtorrent.nix
+    ./programs/sbt.nix
+    ./programs/scmpuff.nix
+    ./programs/senpai.nix
+    ./programs/skim.nix
+    ./programs/sm64ex.nix
+    ./programs/ssh.nix
+    ./programs/starship.nix
+    ./programs/taskwarrior.nix
+    ./programs/terminator.nix
+    ./programs/termite.nix
+    ./programs/texlive.nix
+    ./programs/tmux.nix
+    ./programs/topgrade.nix
+    ./programs/urxvt.nix
+    ./programs/vim.nix
+    ./programs/vscode.nix
+    ./programs/vscode/haskell.nix
+    ./programs/waybar.nix
+    ./programs/xmobar.nix
+    ./programs/z-lua.nix
+    ./programs/zathura.nix
+    ./programs/zoxide.nix
+    ./programs/zplug.nix
+    ./programs/zsh.nix
+    ./programs/zsh/prezto.nix
+    ./services/barrier.nix
+    ./services/blueman-applet.nix
+    ./services/caffeine.nix
+    ./services/cbatticon.nix
+    ./services/clipmenu.nix
+    ./services/compton.nix
+    ./services/devilspie2.nix
+    ./services/dropbox.nix
+    ./services/dunst.nix
+    ./services/dwm-status.nix
+    ./services/emacs.nix
+    ./services/etesync-dav.nix
+    ./services/flameshot.nix
+    ./services/fluidsynth.nix
+    ./services/getmail.nix
+    ./services/gnome-keyring.nix
+    ./services/gpg-agent.nix
+    ./services/grobi.nix
+    ./services/hound.nix
+    ./services/imapnotify.nix
+    ./services/kanshi.nix
+    ./services/kbfs.nix
+    ./services/kdeconnect.nix
+    ./services/keepassx.nix
+    ./services/keybase.nix
+    ./services/keynav.nix
+    ./services/lieer.nix
+    ./services/lorri.nix
+    ./services/mako.nix
+    ./services/mbsync.nix
+    ./services/mpd.nix
+    ./services/mpdris2.nix
+    ./services/mpris-proxy.nix
+    ./services/muchsync.nix
+    ./services/network-manager-applet.nix
+    ./services/nextcloud-client.nix
+    ./services/owncloud-client.nix
+    ./services/pantalaimon.nix
+    ./services/parcellite.nix
+    ./services/pass-secret-service.nix
+    ./services/password-store-sync.nix
+    ./services/pasystray.nix
+    ./services/pbgopy.nix
+    ./services/picom.nix
+    ./services/plan9port.nix
+    ./services/playerctld.nix
+    ./services/polybar.nix
+    ./services/poweralertd.nix
+    ./services/pulseeffects.nix
+    ./services/random-background.nix
+    ./services/redshift-gammastep/gammastep.nix
+    ./services/redshift-gammastep/redshift.nix
+    ./services/rsibreak.nix
+    ./services/screen-locker.nix
+    ./services/spotifyd.nix
+    ./services/stalonetray.nix
+    ./services/status-notifier-watcher.nix
+    ./services/sxhkd.nix
+    ./services/syncthing.nix
+    ./services/taffybar.nix
+    ./services/tahoe-lafs.nix
+    ./services/taskwarrior-sync.nix
+    ./services/udiskie.nix
+    ./services/unclutter.nix
+    ./services/unison.nix
+    ./services/window-managers/awesome.nix
+    ./services/window-managers/bspwm/default.nix
+    ./services/window-managers/i3-sway/i3.nix
+    ./services/window-managers/i3-sway/sway.nix
+    ./services/window-managers/xmonad.nix
+    ./services/wlsunset.nix
+    ./services/xcape.nix
+    ./services/xembed-sni-proxy.nix
+    ./services/xidlehook.nix
+    ./services/xscreensaver.nix
+    ./services/xsettingsd.nix
+    ./services/xsuspender.nix
+    ./systemd.nix
+    ./targets/darwin
+    ./targets/generic-linux.nix
+    ./xcursor.nix
+    ./xresources.nix
+    ./xsession.nix
+    (pkgs.path + "/nixos/modules/misc/assertions.nix")
+    (pkgs.path + "/nixos/modules/misc/meta.nix")
+  ] ++ optional useNixpkgsModule ./misc/nixpkgs.nix;
 
   pkgsModule = { config, ... }: {
     config = {
diff --git a/modules/programs/abook.nix b/modules/programs/abook.nix
index 4ddc080a..bdbf7e87 100644
--- a/modules/programs/abook.nix
+++ b/modules/programs/abook.nix
@@ -27,7 +27,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions =
+      [ (hm.assertions.assertPlatform "programs.abook" pkgs platforms.linux) ];
+
     home.packages = [ pkgs.abook ];
+
     xdg.configFile."abook/abookrc" = mkIf (cfg.extraConfig != "") {
       text = ''
         # Generated by Home Manager.
diff --git a/modules/programs/foot.nix b/modules/programs/foot.nix
index 8df201fd..f02c5b3c 100644
--- a/modules/programs/foot.nix
+++ b/modules/programs/foot.nix
@@ -49,6 +49,9 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions =
+      [ (hm.assertions.assertPlatform "programs.foot" pkgs platforms.linux) ];
+
     home.packages = [ cfg.package ];
 
     xdg.configFile."foot/foot.ini" = mkIf (cfg.settings != { }) {
diff --git a/modules/programs/getmail.nix b/modules/programs/getmail.nix
index eaf297cf..53e39b43 100644
--- a/modules/programs/getmail.nix
+++ b/modules/programs/getmail.nix
@@ -55,6 +55,10 @@ in {
   };
 
   config = mkIf getmailEnabled {
+    assertions = [
+      (hm.assertions.assertPlatform "programs.getmail" pkgs platforms.linux)
+    ];
+
     home.file = foldl' (a: b: a // b) { }
       (map (a: { "${renderConfigFilepath a}".text = renderAccountConfig a; })
         accounts);
diff --git a/modules/programs/i3status-rust.nix b/modules/programs/i3status-rust.nix
index 5d721cc5..b20b5f27 100644
--- a/modules/programs/i3status-rust.nix
+++ b/modules/programs/i3status-rust.nix
@@ -249,6 +249,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (hm.assertions.assertPlatform "programs.i3status-rust" pkgs
+        platforms.linux)
+    ];
+
     home.packages = [ cfg.package ];
 
     xdg.configFile = mapAttrs' (cfgFileSuffix: cfg:
diff --git a/modules/programs/mangohud.nix b/modules/programs/mangohud.nix
index 3a2158e3..b85203e4 100644
--- a/modules/programs/mangohud.nix
+++ b/modules/programs/mangohud.nix
@@ -82,24 +82,25 @@ in {
     };
   };
 
-  config = mkIf cfg.enable (mkMerge [
-    {
-      home.packages = [ cfg.package ];
+  config = mkIf cfg.enable {
+    assertions = [
+      (hm.assertions.assertPlatform "programs.mangohud" pkgs platforms.linux)
+    ];
 
-      home.sessionVariables = mkIf cfg.enableSessionWide {
-        MANGOHUD = 1;
-        MANGOHUD_DLSYM = 1;
-      };
+    home.packages = [ cfg.package ];
 
-      xdg.configFile."MangoHud/MangoHud.conf" =
+    home.sessionVariables = mkIf cfg.enableSessionWide {
+      MANGOHUD = 1;
+      MANGOHUD_DLSYM = 1;
+    };
+
+    xdg.configFile = {
+      "MangoHud/MangoHud.conf" =
         mkIf (cfg.settings != { }) { text = renderSettings cfg.settings; };
-    }
-    {
-      xdg.configFile = mapAttrs'
-        (n: v: nameValuePair "MangoHud/${n}.conf" { text = renderSettings v; })
-        cfg.settingsPerApplication;
-    }
-  ]);
+    } // mapAttrs'
+      (n: v: nameValuePair "MangoHud/${n}.conf" { text = renderSettings v; })
+      cfg.settingsPerApplication;
+  };
 
   meta.maintainers = with maintainers; [ zeratax ];
 }
diff --git a/modules/programs/rofi.nix b/modules/programs/rofi.nix
index f4f7594e..2c06aae4 100644
--- a/modules/programs/rofi.nix
+++ b/modules/programs/rofi.nix
@@ -402,12 +402,15 @@ in {
   };
 
   config = mkIf cfg.enable {
-    assertions = [{
-      assertion = cfg.theme == null || cfg.colors == null;
-      message = ''
-        Cannot use the rofi options 'theme' and 'colors' simultaneously.
-      '';
-    }];
+    assertions = [
+      (hm.assertions.assertPlatform "programs.rofi" pkgs platforms.linux)
+      {
+        assertion = cfg.theme == null || cfg.colors == null;
+        message = ''
+          Cannot use the rofi options 'theme' and 'colors' simultaneously.
+        '';
+      }
+    ];
 
     lib.formats.rasi.mkLiteral = value: {
       _type = "literal";
diff --git a/modules/programs/terminator.nix b/modules/programs/terminator.nix
index d100a9cd..831d7263 100644
--- a/modules/programs/terminator.nix
+++ b/modules/programs/terminator.nix
@@ -63,7 +63,12 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (hm.assertions.assertPlatform "programs.terminator" pkgs platforms.linux)
+    ];
+
     home.packages = [ cfg.package ];
+
     xdg.configFile."terminator/config" =
       mkIf (cfg.config != { }) { text = toConfigObject cfg.config; };
   };
diff --git a/modules/programs/waybar.nix b/modules/programs/waybar.nix
index 3cf919cc..207d311c 100644
--- a/modules/programs/waybar.nix
+++ b/modules/programs/waybar.nix
@@ -353,16 +353,26 @@ in {
     in allWarnings;
 
   in mkIf cfg.enable (mkMerge [
-    { home.packages = [ cfg.package ]; }
+    {
+      assertions = [
+        (lib.hm.assertions.assertPlatform "programs.waybar" pkgs
+          lib.platforms.linux)
+      ];
+
+      home.packages = [ cfg.package ];
+    }
+
     (mkIf (cfg.settings != [ ]) {
       # Generate warnings about defined but unreferenced modules
       inherit warnings;
 
       xdg.configFile."waybar/config".source = configSource;
     })
+
     (mkIf (cfg.style != null) {
       xdg.configFile."waybar/style.css".text = cfg.style;
     })
+
     (mkIf cfg.systemd.enable {
       systemd.user.services.waybar = {
         Unit = {
diff --git a/modules/services/barrier.nix b/modules/services/barrier.nix
index ae9b7d93..5b34e1af 100644
--- a/modules/services/barrier.nix
+++ b/modules/services/barrier.nix
@@ -51,6 +51,11 @@ in {
   };
 
   config = mkIf cfg.client.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.barrier" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services.barrierc = {
       Unit = {
         Description = "Barrier Client daemon";
diff --git a/modules/services/caffeine.nix b/modules/services/caffeine.nix
index bb24a0e0..28ebc7f1 100644
--- a/modules/services/caffeine.nix
+++ b/modules/services/caffeine.nix
@@ -14,6 +14,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.caffeine" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services.caffeine = {
       Unit = { Description = "caffeine"; };
 
diff --git a/modules/services/cbatticon.nix b/modules/services/cbatticon.nix
index a86805dd..1216878c 100644
--- a/modules/services/cbatticon.nix
+++ b/modules/services/cbatticon.nix
@@ -98,6 +98,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.cbatticon" pkgs
+        lib.platforms.linux)
+    ];
+
     home.packages = [ package ];
 
     systemd.user.services.cbatticon = {
diff --git a/modules/services/clipmenu.nix b/modules/services/clipmenu.nix
index 2e1c10e4..3f2055c9 100644
--- a/modules/services/clipmenu.nix
+++ b/modules/services/clipmenu.nix
@@ -21,6 +21,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.clipmenu" pkgs
+        lib.platforms.linux)
+    ];
+
     home.packages = [ cfg.package ];
 
     systemd.user.services.clipmenu = {
diff --git a/modules/services/devilspie2.nix b/modules/services/devilspie2.nix
index 4b93217c..fa77153e 100644
--- a/modules/services/devilspie2.nix
+++ b/modules/services/devilspie2.nix
@@ -27,6 +27,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.devilspie2" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services.devilspie2 = {
       Service.ExecStart = "${pkgs.devilspie2}/bin/devilspie2";
       Unit = {
diff --git a/modules/services/dropbox.nix b/modules/services/dropbox.nix
index bcf3ba2b..81cf8881 100644
--- a/modules/services/dropbox.nix
+++ b/modules/services/dropbox.nix
@@ -28,6 +28,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.dropbox" pkgs
+        lib.platforms.linux)
+    ];
+
     home.packages = [ pkgs.dropbox-cli ];
 
     systemd.user.services.dropbox = {
diff --git a/modules/services/dwm-status.nix b/modules/services/dwm-status.nix
index a0c2a724..005e9dca 100644
--- a/modules/services/dwm-status.nix
+++ b/modules/services/dwm-status.nix
@@ -53,6 +53,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.dwm-status" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services.dwm-status = {
       Unit = {
         Description = "DWM status service";
diff --git a/modules/services/emacs.nix b/modules/services/emacs.nix
index 96c86ee7..fecb19f4 100644
--- a/modules/services/emacs.nix
+++ b/modules/services/emacs.nix
@@ -75,6 +75,11 @@ in {
 
   config = mkIf cfg.enable (mkMerge [
     {
+      assertions = [
+        (lib.hm.assertions.assertPlatform "services.emacs" pkgs
+          lib.platforms.linux)
+      ];
+
       systemd.user.services.emacs = {
         Unit = {
           Description = "Emacs text editor";
diff --git a/modules/services/etesync-dav.nix b/modules/services/etesync-dav.nix
index 8bc5aa7a..76819aaf 100644
--- a/modules/services/etesync-dav.nix
+++ b/modules/services/etesync-dav.nix
@@ -45,6 +45,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.etesync-dav" pkgs
+        lib.platforms.linux)
+    ];
+
     home.packages = [ cfg.package ];
 
     systemd.user.services.etesync-dav = {
diff --git a/modules/services/flameshot.nix b/modules/services/flameshot.nix
index 13fb7ea2..ed523561 100644
--- a/modules/services/flameshot.nix
+++ b/modules/services/flameshot.nix
@@ -13,6 +13,11 @@ in {
   options = { services.flameshot = { enable = mkEnableOption "Flameshot"; }; };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.flameshot" pkgs
+        lib.platforms.linux)
+    ];
+
     home.packages = [ package ];
 
     systemd.user.services.flameshot = {
diff --git a/modules/services/fluidsynth.nix b/modules/services/fluidsynth.nix
index 18913fe5..1b5a0c5f 100644
--- a/modules/services/fluidsynth.nix
+++ b/modules/services/fluidsynth.nix
@@ -37,6 +37,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.fluidsynth" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services.fluidsynth = {
       Unit = {
         Description = "FluidSynth Daemon";
diff --git a/modules/services/getmail.nix b/modules/services/getmail.nix
index e7a1b1a4..83ed4ed4 100644
--- a/modules/services/getmail.nix
+++ b/modules/services/getmail.nix
@@ -37,6 +37,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.getmail" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services.getmail = {
       Unit = { Description = "getmail email fetcher"; };
       Service = { ExecStart = "${pkgs.getmail}/bin/getmail ${configFiles}"; };
diff --git a/modules/services/gnome-keyring.nix b/modules/services/gnome-keyring.nix
index 7e3f8bbc..7267129d 100644
--- a/modules/services/gnome-keyring.nix
+++ b/modules/services/gnome-keyring.nix
@@ -25,6 +25,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.gnome-keyring" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services.gnome-keyring = {
       Unit = {
         Description = "GNOME Keyring";
diff --git a/modules/services/grobi.nix b/modules/services/grobi.nix
index 4dfc5d63..682458fd 100644
--- a/modules/services/grobi.nix
+++ b/modules/services/grobi.nix
@@ -71,6 +71,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.grobi" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services.grobi = {
       Unit = {
         Description = "grobi display auto config daemon";
diff --git a/modules/services/hound.nix b/modules/services/hound.nix
index 07b5d476..12c1f5d5 100644
--- a/modules/services/hound.nix
+++ b/modules/services/hound.nix
@@ -59,6 +59,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.hound" pkgs
+        lib.platforms.linux)
+    ];
+
     home.packages = [ pkgs.hound ];
 
     systemd.user.services.hound = {
diff --git a/modules/services/imapnotify.nix b/modules/services/imapnotify.nix
index 4b3ebda7..5d7c5f4b 100644
--- a/modules/services/imapnotify.nix
+++ b/modules/services/imapnotify.nix
@@ -77,6 +77,8 @@ in {
             + concatMapStringsSep ", " (a: a.name) badAccounts;
         };
     in [
+      (lib.hm.assertions.assertPlatform "services.imapnotify" pkgs
+        lib.platforms.linux)
       (checkAccounts (a: a.maildir == null) "maildir configuration")
       (checkAccounts (a: a.imap == null) "IMAP configuration")
       (checkAccounts (a: a.passwordCommand == null) "password command")
diff --git a/modules/services/kanshi.nix b/modules/services/kanshi.nix
index 8df32121..ce6e2522 100644
--- a/modules/services/kanshi.nix
+++ b/modules/services/kanshi.nix
@@ -187,6 +187,10 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.kanshi" pkgs
+        lib.platforms.linux)
+    ];
 
     xdg.configFile."kanshi/config".text = ''
       ${concatStringsSep "\n" (mapAttrsToList profileStr cfg.profiles)}
diff --git a/modules/services/kbfs.nix b/modules/services/kbfs.nix
index d4be2592..4f1bfd8b 100644
--- a/modules/services/kbfs.nix
+++ b/modules/services/kbfs.nix
@@ -32,6 +32,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.kbfs" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services.kbfs = {
       Unit = {
         Description = "Keybase File System";
diff --git a/modules/services/keybase.nix b/modules/services/keybase.nix
index 0aec0bbc..f6e40086 100644
--- a/modules/services/keybase.nix
+++ b/modules/services/keybase.nix
@@ -10,6 +10,11 @@ in {
   options.services.keybase.enable = mkEnableOption "Keybase";
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.keybase" pkgs
+        lib.platforms.linux)
+    ];
+
     home.packages = [ pkgs.keybase ];
 
     systemd.user.services.keybase = {
diff --git a/modules/services/keynav.nix b/modules/services/keynav.nix
index c7f1df37..d83252e5 100644
--- a/modules/services/keynav.nix
+++ b/modules/services/keynav.nix
@@ -10,6 +10,11 @@ in {
   options.services.keynav = { enable = mkEnableOption "keynav"; };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.keynav" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services.keynav = {
       Unit = {
         Description = "keynav";
diff --git a/modules/services/lieer.nix b/modules/services/lieer.nix
index 71f0a66e..9dd8c15e 100644
--- a/modules/services/lieer.nix
+++ b/modules/services/lieer.nix
@@ -61,6 +61,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.lieer" pkgs
+        lib.platforms.linux)
+    ];
+
     programs.lieer.enable = true;
     systemd.user.services = listToAttrs (map serviceUnit syncAccounts);
     systemd.user.timers = listToAttrs (map timerUnit syncAccounts);
diff --git a/modules/services/lorri.nix b/modules/services/lorri.nix
index 61836990..5e749532 100644
--- a/modules/services/lorri.nix
+++ b/modules/services/lorri.nix
@@ -21,6 +21,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.lorri" pkgs
+        lib.platforms.linux)
+    ];
+
     home.packages = [ cfg.package ];
 
     systemd.user = {
diff --git a/modules/services/mako.nix b/modules/services/mako.nix
index e8f4d38c..b09f90a1 100644
--- a/modules/services/mako.nix
+++ b/modules/services/mako.nix
@@ -292,7 +292,11 @@ in {
     optionalString = name: val:
       lib.optionalString (val != null) "${name}=${val}";
   in mkIf cfg.enable {
+    assertions =
+      [ (hm.assertions.assertPlatform "services.mako" pkgs platforms.linux) ];
+
     home.packages = [ pkgs.mako ];
+
     xdg.configFile."mako/config".text = ''
       ${optionalInteger "max-visible" cfg.maxVisible}
       ${optionalString "sort" cfg.sort}
diff --git a/modules/services/mbsync.nix b/modules/services/mbsync.nix
index ac6ac1ef..b52b6885 100644
--- a/modules/services/mbsync.nix
+++ b/modules/services/mbsync.nix
@@ -76,6 +76,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.mbsync" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services.mbsync = {
       Unit = { Description = "mbsync mailbox synchronization"; };
 
diff --git a/modules/services/mpd.nix b/modules/services/mpd.nix
index a6ed0a48..5800a18c 100644
--- a/modules/services/mpd.nix
+++ b/modules/services/mpd.nix
@@ -143,6 +143,10 @@ in {
   ###### implementation
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.mpd" pkgs
+        lib.platforms.linux)
+    ];
 
     systemd.user.services.mpd = {
       Unit = {
diff --git a/modules/services/mpdris2.nix b/modules/services/mpdris2.nix
index cb8cefba..88ea50af 100644
--- a/modules/services/mpdris2.nix
+++ b/modules/services/mpdris2.nix
@@ -74,10 +74,15 @@ in {
   };
 
   config = mkIf cfg.enable {
-    assertions = [{
-      assertion = config.services.mpd.enable;
-      message = "The mpdris2 module requires 'services.mpd.enable = true'.";
-    }];
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.mpdris2" pkgs
+        lib.platforms.linux)
+
+      {
+        assertion = config.services.mpd.enable;
+        message = "The mpdris2 module requires 'services.mpd.enable = true'.";
+      }
+    ];
 
     xdg.configFile."mpDris2/mpDris2.conf".text = toIni mpdris2Conf;
 
diff --git a/modules/services/mpris-proxy.nix b/modules/services/mpris-proxy.nix
index 69f56c21..9996b137 100644
--- a/modules/services/mpris-proxy.nix
+++ b/modules/services/mpris-proxy.nix
@@ -13,6 +13,11 @@ in {
     "a proxy forwarding Bluetooth MIDI controls via MPRIS2 to control media players";
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.mpris-proxy" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services.mpris-proxy = {
       Unit = {
         Description =
diff --git a/modules/services/muchsync.nix b/modules/services/muchsync.nix
index b7004418..39899bfb 100644
--- a/modules/services/muchsync.nix
+++ b/modules/services/muchsync.nix
@@ -156,12 +156,16 @@ in {
       (name: remoteCfg: nameValuePair "muchsync-${name}" (gen name remoteCfg))
       cfg.remotes;
   in mkIf (cfg.remotes != { }) {
-    assertions = [{
-      assertion = config.programs.notmuch.enable;
-      message = ''
-        The muchsync module requires 'programs.notmuch.enable = true'.
-      '';
-    }];
+    assertions = [
+      (hm.assertions.assertPlatform "services.muchsync" pkgs platforms.linux)
+
+      {
+        assertion = config.programs.notmuch.enable;
+        message = ''
+          The muchsync module requires 'programs.notmuch.enable = true'.
+        '';
+      }
+    ];
 
     systemd.user.services = mapRemotes (name: remoteCfg: {
       Unit = { Description = "muchsync sync service (${name})"; };
diff --git a/modules/services/network-manager-applet.nix b/modules/services/network-manager-applet.nix
index b84861a9..f4abe86e 100644
--- a/modules/services/network-manager-applet.nix
+++ b/modules/services/network-manager-applet.nix
@@ -16,6 +16,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.network-manager-applet" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services.network-manager-applet = {
       Unit = {
         Description = "Network Manager applet";
diff --git a/modules/services/nextcloud-client.nix b/modules/services/nextcloud-client.nix
index 4e56c4f5..b787a6d6 100644
--- a/modules/services/nextcloud-client.nix
+++ b/modules/services/nextcloud-client.nix
@@ -28,6 +28,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.nextcloud-client" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services.nextcloud-client = {
       Unit = {
         Description = "Nextcloud Client";
diff --git a/modules/services/pantalaimon.nix b/modules/services/pantalaimon.nix
index 38662a34..ac049e50 100644
--- a/modules/services/pantalaimon.nix
+++ b/modules/services/pantalaimon.nix
@@ -55,6 +55,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.pantalaimon" pkgs
+        lib.platforms.linux)
+    ];
+
     home.packages = [ cfg.package ];
 
     systemd.user.services = {
diff --git a/modules/services/parcellite.nix b/modules/services/parcellite.nix
index dddb0631..617fe6fb 100644
--- a/modules/services/parcellite.nix
+++ b/modules/services/parcellite.nix
@@ -22,6 +22,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.parcellite" pkgs
+        lib.platforms.linux)
+    ];
+
     home.packages = [ cfg.package ];
 
     systemd.user.services.parcellite = {
diff --git a/modules/services/pass-secret-service.nix b/modules/services/pass-secret-service.nix
index d2ed11ee..06b5be1f 100644
--- a/modules/services/pass-secret-service.nix
+++ b/modules/services/pass-secret-service.nix
@@ -9,11 +9,16 @@ in {
     enable = mkEnableOption "Pass libsecret service";
   };
   config = mkIf serviceCfg.enable {
-    assertions = [{
-      assertion = config.programs.password-store.enable;
-      message = "The 'services.pass-secret-service' module requires"
-        + " 'programs.password-store.enable = true'.";
-    }];
+    assertions = [
+      (hm.assertions.assertPlatform "services.pass-secret-service" pkgs
+        platforms.linux)
+
+      {
+        assertion = config.programs.password-store.enable;
+        message = "The 'services.pass-secret-service' module requires"
+          + " 'programs.password-store.enable = true'.";
+      }
+    ];
 
     systemd.user.services.pass-secret-service = {
       Unit = { Description = "Pass libsecret service"; };
diff --git a/modules/services/password-store-sync.nix b/modules/services/password-store-sync.nix
index 81933914..c8dbe808 100644
--- a/modules/services/password-store-sync.nix
+++ b/modules/services/password-store-sync.nix
@@ -33,11 +33,16 @@ in {
   };
 
   config = mkIf serviceCfg.enable {
-    assertions = [{
-      assertion = programCfg.enable;
-      message = "The 'services.password-store-sync' module requires"
-        + " 'programs.password-store.enable = true'.";
-    }];
+    assertions = [
+      (hm.assertions.assertPlatform "services.password-store-sync" pkgs
+        platforms.linux)
+
+      {
+        assertion = programCfg.enable;
+        message = "The 'services.password-store-sync' module requires"
+          + " 'programs.password-store.enable = true'.";
+      }
+    ];
 
     systemd.user.services.password-store-sync = {
       Unit = { Description = "Password store sync"; };
diff --git a/modules/services/pbgopy.nix b/modules/services/pbgopy.nix
index f4fd4f53..487aa4f3 100644
--- a/modules/services/pbgopy.nix
+++ b/modules/services/pbgopy.nix
@@ -50,6 +50,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.pbgopy" pkgs
+        lib.platforms.linux)
+    ];
+
     home.packages = [ package ];
 
     systemd.user.services.pbgopy = {
diff --git a/modules/services/picom.nix b/modules/services/picom.nix
index 4c4da8de..617c0756 100644
--- a/modules/services/picom.nix
+++ b/modules/services/picom.nix
@@ -283,6 +283,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.picom" pkgs
+        lib.platforms.linux)
+    ];
+
     home.packages = [ cfg.package ];
 
     systemd.user.services.picom = {
diff --git a/modules/services/plan9port.nix b/modules/services/plan9port.nix
index 0f5893f2..24980472 100644
--- a/modules/services/plan9port.nix
+++ b/modules/services/plan9port.nix
@@ -16,7 +16,10 @@ in {
       mkEnableOption "the Plan 9 file system for interprocess messaging";
   };
 
-  config = {
+  config = mkIf (cfg.fontsrv.enable || cfg.plumber.enable) {
+    assertions = [
+      (hm.assertions.assertPlatform "services.plan9port" pkgs platforms.linux)
+    ];
 
     systemd.user.services.fontsrv = mkIf cfg.fontsrv.enable {
       Unit.Description = "the Plan 9 file system access to host fonts";
diff --git a/modules/services/playerctld.nix b/modules/services/playerctld.nix
index 63e7b8fe..5e48896b 100644
--- a/modules/services/playerctld.nix
+++ b/modules/services/playerctld.nix
@@ -21,6 +21,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.playerctld" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services.playerctld = {
       Unit.Description = "MPRIS media player daemon";
 
diff --git a/modules/services/polybar.nix b/modules/services/polybar.nix
index 8a8e9994..9f762777 100644
--- a/modules/services/polybar.nix
+++ b/modules/services/polybar.nix
@@ -191,6 +191,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.polybar" pkgs
+        lib.platforms.linux)
+    ];
+
     home.packages = [ cfg.package ];
     xdg.configFile."polybar/config".source = configFile;
 
diff --git a/modules/services/poweralertd.nix b/modules/services/poweralertd.nix
index 39fffd7c..cae44c75 100644
--- a/modules/services/poweralertd.nix
+++ b/modules/services/poweralertd.nix
@@ -11,6 +11,11 @@ in {
     mkEnableOption "the Upower-powered power alerterd";
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.poweralertd" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services.poweralertd = {
       Unit = {
         Description = "UPower-powered power alerter";
diff --git a/modules/services/pulseeffects.nix b/modules/services/pulseeffects.nix
index 184c2af7..bad04e4e 100644
--- a/modules/services/pulseeffects.nix
+++ b/modules/services/pulseeffects.nix
@@ -33,6 +33,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.pulseeffects" pkgs
+        lib.platforms.linux)
+    ];
+
     # running pulseeffects will just attach itself to gapplication service
     # at-spi2-core is to minimize journalctl noise of:
     # "AT-SPI: Error retrieving accessibility bus address: org.freedesktop.DBus.Error.ServiceUnknown: The name org.a11y.Bus was not provided by any .service files"
diff --git a/modules/services/redshift-gammastep/lib/options.nix b/modules/services/redshift-gammastep/lib/options.nix
index 11ce9d7c..e79c5df1 100644
--- a/modules/services/redshift-gammastep/lib/options.nix
+++ b/modules/services/redshift-gammastep/lib/options.nix
@@ -146,20 +146,25 @@ in {
   };
 
   config = {
-    assertions = [{
-      assertion = (cfg.settings ? ${mainSection}.dawn-time || cfg.settings
-        ? ${mainSection}.dusk-time)
-        || (cfg.settings.${mainSection}.location-provider) == "geoclue2"
-        || ((cfg.settings.${mainSection}.location-provider) == "manual"
-          && (cfg.settings ? manual.lat || cfg.settings ? manual.lon));
-      message = ''
-        In order for ${programName} to know the time of action, you need to set one of
-          - services.${moduleName}.provider = "geoclue2" for automatically inferring your location
-            (you also need to enable Geoclue2 service separately)
-          - services.${moduleName}.longitude and .latitude for specifying your location manually
-          - services.${moduleName}.dawnTime and .duskTime for specifying the times manually
-      '';
-    }];
+    assertions = [
+      (hm.assertions.assertPlatform "services.${moduleName}" pkgs
+        platforms.linux)
+
+      {
+        assertion = (cfg.settings ? ${mainSection}.dawn-time || cfg.settings
+          ? ${mainSection}.dusk-time)
+          || (cfg.settings.${mainSection}.location-provider) == "geoclue2"
+          || ((cfg.settings.${mainSection}.location-provider) == "manual"
+            && (cfg.settings ? manual.lat || cfg.settings ? manual.lon));
+        message = ''
+          In order for ${programName} to know the time of action, you need to set one of
+            - services.${moduleName}.provider = "geoclue2" for automatically inferring your location
+              (you also need to enable Geoclue2 service separately)
+            - services.${moduleName}.longitude and .latitude for specifying your location manually
+            - services.${moduleName}.dawnTime and .duskTime for specifying the times manually
+        '';
+      }
+    ];
 
     services.${moduleName}.settings = {
       ${mainSection} = {
diff --git a/modules/services/rsibreak.nix b/modules/services/rsibreak.nix
index 5f07e6a0..351632a0 100644
--- a/modules/services/rsibreak.nix
+++ b/modules/services/rsibreak.nix
@@ -14,6 +14,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.rsibreak" pkgs
+        lib.platforms.linux)
+    ];
+
     home.packages = [ pkgs.rsibreak ];
     systemd.user.services.rsibreak = {
       Unit = {
diff --git a/modules/services/screen-locker.nix b/modules/services/screen-locker.nix
index 554d64f9..4da24b74 100644
--- a/modules/services/screen-locker.nix
+++ b/modules/services/screen-locker.nix
@@ -53,6 +53,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.screen-locker" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services.xautolock-session = {
       Unit = {
         Description = "xautolock, session locker service";
diff --git a/modules/services/spotifyd.nix b/modules/services/spotifyd.nix
index ee5af345..f15954d7 100644
--- a/modules/services/spotifyd.nix
+++ b/modules/services/spotifyd.nix
@@ -43,6 +43,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.spotifyd" pkgs
+        lib.platforms.linux)
+    ];
+
     home.packages = [ cfg.package ];
 
     systemd.user.services.spotifyd = {
diff --git a/modules/services/status-notifier-watcher.nix b/modules/services/status-notifier-watcher.nix
index 8ff1cace..b5d1bcd4 100644
--- a/modules/services/status-notifier-watcher.nix
+++ b/modules/services/status-notifier-watcher.nix
@@ -26,6 +26,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.status-notifier-watcher" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services.status-notifier-watcher = {
       Unit = {
         Description = "SNI watcher";
diff --git a/modules/services/sxhkd.nix b/modules/services/sxhkd.nix
index 9a2027a8..363c1fb2 100644
--- a/modules/services/sxhkd.nix
+++ b/modules/services/sxhkd.nix
@@ -65,6 +65,11 @@ in
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.sxhkd" pkgs
+        lib.platforms.linux)
+    ];
+
     home.packages = [ cfg.package ];
 
     xdg.configFile."sxhkd/sxhkdrc".text = concatStringsSep "\n" [
diff --git a/modules/services/taskwarrior-sync.nix b/modules/services/taskwarrior-sync.nix
index d16c0681..ddce6d6f 100644
--- a/modules/services/taskwarrior-sync.nix
+++ b/modules/services/taskwarrior-sync.nix
@@ -29,6 +29,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.taskwarrior-sync" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services.taskwarrior-sync = {
       Unit = { Description = "Taskwarrior sync"; };
       Service = {
diff --git a/modules/services/unclutter.nix b/modules/services/unclutter.nix
index 5e760639..3c70cd03 100644
--- a/modules/services/unclutter.nix
+++ b/modules/services/unclutter.nix
@@ -37,6 +37,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.unclutter" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services.unclutter = {
       Unit = {
         Description = "unclutter";
diff --git a/modules/services/unison.nix b/modules/services/unison.nix
index a9cf23fb..40b63ad4 100644
--- a/modules/services/unison.nix
+++ b/modules/services/unison.nix
@@ -93,6 +93,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.unison" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services = makeDefs (name: pairCfg: {
       Unit = {
         Description = "Unison pair sync (${name})";
diff --git a/modules/services/window-managers/awesome.nix b/modules/services/window-managers/awesome.nix
index d2e2903f..15af2c2d 100644
--- a/modules/services/window-managers/awesome.nix
+++ b/modules/services/window-managers/awesome.nix
@@ -45,7 +45,13 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (hm.assertions.assertPlatform "xsession.windowManager.awesome" pkgs
+        platforms.linux)
+    ];
+
     home.packages = [ awesome ];
+
     xsession.windowManager.command = "${awesome}/bin/awesome "
       + optionalString cfg.noArgb "--no-argb " + makeSearchPath cfg.luaModules;
   };
diff --git a/modules/services/window-managers/bspwm/default.nix b/modules/services/window-managers/bspwm/default.nix
index c43be074..c2b8fd49 100644
--- a/modules/services/window-managers/bspwm/default.nix
+++ b/modules/services/window-managers/bspwm/default.nix
@@ -42,6 +42,11 @@ in {
   options = import ./options.nix { inherit pkgs lib; };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (hm.assertions.assertPlatform "xsession.windowManager.bspwm" pkgs
+        platforms.linux)
+    ];
+
     home.packages = [ cfg.package ];
 
     xdg.configFile."bspwm/bspwmrc".source = pkgs.writeShellScript "bspwmrc" ''
diff --git a/modules/services/window-managers/i3-sway/i3.nix b/modules/services/window-managers/i3-sway/i3.nix
index 5cba45bd..e45d415d 100644
--- a/modules/services/window-managers/i3-sway/i3.nix
+++ b/modules/services/window-managers/i3-sway/i3.nix
@@ -241,8 +241,15 @@ in {
 
   config = mkIf cfg.enable (mkMerge [
     {
+      assertions = [
+        (hm.assertions.assertPlatform "xsession.windowManager.i3" pkgs
+          platforms.linux)
+      ];
+
       home.packages = [ cfg.package ];
+
       xsession.windowManager.command = "${cfg.package}/bin/i3";
+
       xdg.configFile."i3/config" = {
         source = checkI3Config;
         onChange = ''
diff --git a/modules/services/window-managers/i3-sway/sway.nix b/modules/services/window-managers/i3-sway/sway.nix
index 61b430b8..6fed3701 100644
--- a/modules/services/window-managers/i3-sway/sway.nix
+++ b/modules/services/window-managers/i3-sway/sway.nix
@@ -427,8 +427,14 @@ in {
     })
 
     {
+      assertions = [
+        (hm.assertions.assertPlatform "wayland.windowManager.sway" pkgs
+          platforms.linux)
+      ];
+
       home.packages = optional (cfg.package != null) cfg.package
         ++ optional cfg.xwayland pkgs.xwayland;
+
       xdg.configFile."sway/config" = {
         source = configFile;
         onChange = ''
@@ -439,6 +445,7 @@ in {
           fi
         '';
       };
+
       systemd.user.targets.sway-session = mkIf cfg.systemdIntegration {
         Unit = {
           Description = "sway compositor session";
diff --git a/modules/services/window-managers/xmonad.nix b/modules/services/window-managers/xmonad.nix
index 6d05d68e..78416024 100644
--- a/modules/services/window-managers/xmonad.nix
+++ b/modules/services/window-managers/xmonad.nix
@@ -137,10 +137,23 @@ in {
       }/bin/xmonad-${pkgs.hostPlatform.system}";
 
   in mkIf cfg.enable (mkMerge [
-    { home.packages = [ (lowPrio xmonad) ]; }
+    {
+      assertions = [
+        (hm.assertions.assertPlatform "xsession.windowManager.xmonad" pkgs
+          platforms.linux)
+      ];
+
+      home.packages = [ (lowPrio xmonad) ];
+
+      home.file = mapAttrs' (name: value:
+        attrsets.nameValuePair (".xmonad/lib/" + name) { source = value; })
+        cfg.libFiles;
+    }
+
     (mkIf (cfg.config == null) {
       xsession.windowManager.command = "${xmonad}/bin/xmonad";
     })
+
     (mkIf (cfg.config != null) {
       xsession.windowManager.command = xmonadBin;
       home.file.".xmonad/xmonad.hs".source = cfg.config;
@@ -156,10 +169,5 @@ in {
       };
     })
 
-    {
-      home.file = mapAttrs' (name: value:
-        attrsets.nameValuePair (".xmonad/lib/" + name) { source = value; })
-        cfg.libFiles;
-    }
   ]);
 }
diff --git a/modules/services/wlsunset.nix b/modules/services/wlsunset.nix
index 084dbdb7..28e595af 100644
--- a/modules/services/wlsunset.nix
+++ b/modules/services/wlsunset.nix
@@ -73,6 +73,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.wlsunset" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services.wlsunset = {
       Unit = {
         Description = "Day/night gamma adjustments for Wayland compositors.";
diff --git a/modules/services/xcape.nix b/modules/services/xcape.nix
index f4f77caa..6b29d26e 100644
--- a/modules/services/xcape.nix
+++ b/modules/services/xcape.nix
@@ -53,6 +53,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.xcape" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services.xcape = {
       Unit = {
         Description = "xcape";
diff --git a/modules/services/xembed-sni-proxy.nix b/modules/services/xembed-sni-proxy.nix
index ff63d108..f0a7e29e 100644
--- a/modules/services/xembed-sni-proxy.nix
+++ b/modules/services/xembed-sni-proxy.nix
@@ -26,6 +26,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.xembed-sni-proxy" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services.xembed-sni-proxy = {
       Unit = {
         Description = "XEmbed SNI Proxy";
diff --git a/modules/services/xidlehook.nix b/modules/services/xidlehook.nix
index da91de85..c39e3e3a 100644
--- a/modules/services/xidlehook.nix
+++ b/modules/services/xidlehook.nix
@@ -132,6 +132,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.xidlehook" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services.xidlehook = {
       Unit = {
         Description = "xidlehook service";
diff --git a/modules/services/xscreensaver.nix b/modules/services/xscreensaver.nix
index ac6194e7..3c0661e8 100644
--- a/modules/services/xscreensaver.nix
+++ b/modules/services/xscreensaver.nix
@@ -29,6 +29,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.xscreensaver" pkgs
+        lib.platforms.linux)
+    ];
+
     # To make the xscreensaver-command tool available.
     home.packages = [ pkgs.xscreensaver ];
 
diff --git a/modules/services/xsettingsd.nix b/modules/services/xsettingsd.nix
index 2ae846b6..86336b21 100644
--- a/modules/services/xsettingsd.nix
+++ b/modules/services/xsettingsd.nix
@@ -25,6 +25,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.xsettingsd" pkgs
+        lib.platforms.linux)
+    ];
+
     systemd.user.services.xsettingsd = {
       Unit = {
         Description = "xsettingsd";
diff --git a/modules/services/xsuspender.nix b/modules/services/xsuspender.nix
index 7d855f05..54f13c8d 100644
--- a/modules/services/xsuspender.nix
+++ b/modules/services/xsuspender.nix
@@ -148,6 +148,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.xsuspender" pkgs
+        lib.platforms.linux)
+    ];
+
     services.xsuspender.iniContent = let
       mkSection = values:
         filterAttrs (_: v: v != null) {
diff --git a/modules/targets/darwin/default.nix b/modules/targets/darwin/default.nix
index b971e18d..d2764bd1 100644
--- a/modules/targets/darwin/default.nix
+++ b/modules/targets/darwin/default.nix
@@ -43,6 +43,11 @@ in {
   };
 
   config = mkIf (activationCmds != [ ]) {
+    assertions = [
+      (hm.assertions.assertPlatform "targets.darwin.defaults" pkgs
+        platforms.darwin)
+    ];
+
     home.activation.setDarwinDefaults = hm.dag.entryAfter [ "writeBoundary" ] ''
       $VERBOSE_ECHO "Configuring macOS user defaults"
       ${concatStringsSep "\n" activationCmds}
diff --git a/modules/targets/darwin/fonts.nix b/modules/targets/darwin/fonts.nix
index bc4042a8..cd26fa08 100644
--- a/modules/targets/darwin/fonts.nix
+++ b/modules/targets/darwin/fonts.nix
@@ -12,16 +12,18 @@ let
   fonts = "${fontsEnv}/share/fonts";
 in {
   # macOS won't recognize symlinked fonts
-  config.home.activation.copyFonts = hm.dag.entryAfter [ "writeBoundary" ] ''
-    copyFonts() {
-      rm -rf ${homeDir}/Library/Fonts/HomeManager || :
+  config = mkIf pkgs.hostPlatform.isDarwin {
+    home.activation.copyFonts = hm.dag.entryAfter [ "writeBoundary" ] ''
+      copyFonts() {
+        rm -rf ${homeDir}/Library/Fonts/HomeManager || :
 
-      local f
-      find -L "${fonts}" -type f -printf '%P\0' | while IFS= read -rd "" f; do
-        $DRY_RUN_CMD install $VERBOSE_ARG -Dm644 -T \
-          "${fonts}/$f" "${homeDir}/Library/Fonts/HomeManager/$f"
-      done
-    }
-    copyFonts
-  '';
+        local f
+        find -L "${fonts}" -type f -printf '%P\0' | while IFS= read -rd "" f; do
+          $DRY_RUN_CMD install $VERBOSE_ARG -Dm644 -T \
+            "${fonts}/$f" "${homeDir}/Library/Fonts/HomeManager/$f"
+        done
+      }
+      copyFonts
+    '';
+  };
 }
diff --git a/modules/targets/darwin/keybindings.nix b/modules/targets/darwin/keybindings.nix
index 4481f33b..824daa57 100644
--- a/modules/targets/darwin/keybindings.nix
+++ b/modules/targets/darwin/keybindings.nix
@@ -31,6 +31,11 @@ in {
   };
 
   config = mkIf (cfg.keybindings != { }) {
+    assertions = [
+      (hm.assertions.assertPlatform "targets.darwin.keybindings" pkgs
+        platforms.darwin)
+    ];
+
     # NOTE: just copy the files because symlinks won't be recognized by macOS
     home.activation.setCocoaKeybindings =
       hm.dag.entryAfter [ "writeBoundary" ] ''
diff --git a/modules/targets/darwin/search.nix b/modules/targets/darwin/search.nix
index 2afbae4a..8e0df3b2 100644
--- a/modules/targets/darwin/search.nix
+++ b/modules/targets/darwin/search.nix
@@ -20,6 +20,11 @@ in {
   };
 
   config = mkIf (cfg.search != null) {
+    assertions = [
+      (hm.assertions.assertPlatform "targets.darwin.search" pkgs
+        platforms.darwin)
+    ];
+
     targets.darwin.defaults = {
       NSGlobalDomain.NSPreferredWebServices = {
         NSWebServicesProviderWebSearch = {
diff --git a/modules/targets/generic-linux.nix b/modules/targets/generic-linux.nix
index 6e17bd28..b7680885 100644
--- a/modules/targets/generic-linux.nix
+++ b/modules/targets/generic-linux.nix
@@ -27,6 +27,10 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (hm.assertions.assertPlatform "targets.genericLinux" pkgs platforms.linux)
+    ];
+
     xdg.systemDirs.data = [
       # Nix profiles
       "\${NIX_STATE_DIR:-/nix/var/nix}/profiles/default/share"
diff --git a/modules/xcursor.nix b/modules/xcursor.nix
index 65b5c770..620e2e28 100644
--- a/modules/xcursor.nix
+++ b/modules/xcursor.nix
@@ -55,6 +55,10 @@ in {
   };
 
   config = mkIf (cfg != null) {
+    assertions = [
+      (hm.assertions.assertPlatform "xsession.pointerCursor" pkgs
+        platforms.linux)
+    ];
 
     home.packages = [ cfg.package ];
 
diff --git a/modules/xsession.nix b/modules/xsession.nix
index b79c81c4..215d691d 100644
--- a/modules/xsession.nix
+++ b/modules/xsession.nix
@@ -85,6 +85,9 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions =
+      [ (hm.assertions.assertPlatform "xsession" pkgs platforms.linux) ];
+
     xsession.importedVariables = [
       "DBUS_SESSION_BUS_ADDRESS"
       "DISPLAY"