pipewire: fix build for FreeBSD (#387712)

pkgs/development/libraries/pipewire/default.nix

···
   python3,
   meson,
   ninja,
+  freebsd,
   elogind,
+  libinotify-kqueue,
+  epoll-shim,
   systemd,
-  enableSystemd ? true, # enableSystemd=false maintained by maintainers.qyliss.
+  enableSystemd ? lib.meta.availableOn stdenv.hostPlatform systemd, # enableSystemd=false maintained by maintainers.qyliss.
   pkg-config,
   docutils,
   doxygen,
···
   libcanberra,
   xorg,
   libmysofa,
-  ffadoSupport ? x11Support && lib.systems.equals stdenv.buildPlatform stdenv.hostPlatform,
+  ffadoSupport ?
+    x11Support
+    && lib.systems.equals stdenv.buildPlatform stdenv.hostPlatform
+    && lib.meta.availableOn stdenv.hostPlatform ffado,
   ffado,
   libselinux,
   libebur128,
···
     webrtc-audio-processing_1
     webrtc-audio-processing
   ];
+
+  bluezSupport = stdenv.hostPlatform.isLinux;
+  modemmanagerSupport = lib.meta.availableOn stdenv.hostPlatform modemmanager;
+  libcameraSupport = lib.meta.availableOn stdenv.hostPlatform libcamera;
+  ldacbtSupport = lib.meta.availableOn stdenv.hostPlatform ldacbt;
 in
 
 stdenv.mkDerivation (finalAttrs: {
···
 
   buildInputs =
     [
-      alsa-lib
-      bluez
       dbus
-      fdk_aac
       ffmpeg
       fftwFloat
       glib
       gst_all_1.gst-plugins-base
       gst_all_1.gstreamer
-      libcamera
       libebur128
       libjack2
-      libfreeaptx
-      liblc3
       libmysofa
       libopus
       libpulseaudio
       libusb1
-      libselinux
       libsndfile
       lilv
-      modemmanager
       ncurses
       readline
-      sbc
     ]
     ++ (
       if enableSystemd then
         [ systemd ]
-      else
+      else if stdenv.hostPlatform.isLinux then
         [
           elogind
           udev
         ]
+      else
+        [ ]
     )
+    ++ lib.optionals stdenv.hostPlatform.isFreeBSD [
+      libinotify-kqueue
+      epoll-shim
+      freebsd.libstdthreads
+    ]
     ++ lib.take 1 webrtc-audio-processings
-    ++ lib.optional (lib.meta.availableOn stdenv.hostPlatform ldacbt) ldacbt
+    ++ lib.optional stdenv.hostPlatform.isLinux alsa-lib
+    ++ lib.optional ldacbtSupport ldacbt
+    ++ lib.optional libcameraSupport libcamera
     ++ lib.optional zeroconfSupport avahi
     ++ lib.optional raopSupport openssl
     ++ lib.optional rocSupport roc-toolkit
···
       xorg.libX11
       xorg.libXfixes
     ]
-    ++ lib.optional ffadoSupport ffado;
+    ++ lib.optionals bluezSupport [
+      bluez
+      libfreeaptx
+      liblc3
+      sbc
+      fdk_aac
+    ]
+    ++ lib.optional ffadoSupport ffado
+    ++ lib.optional stdenv.hostPlatform.isLinux libselinux
+    ++ lib.optional modemmanagerSupport modemmanager;
 
   # Valgrind binary is required for running one optional test.
   nativeCheckInputs = lib.optional (lib.meta.availableOn stdenv.hostPlatform valgrind) valgrind;
 
   mesonFlags = [
+    (lib.mesonEnable "pipewire-alsa" stdenv.hostPlatform.isLinux)
+    (lib.mesonEnable "alsa" stdenv.hostPlatform.isLinux)
     (lib.mesonEnable "docs" true)
     (lib.mesonOption "udevrulesdir" "lib/udev/rules.d")
     (lib.mesonEnable "installed_tests" true)
     (lib.mesonOption "installed_test_prefix" (placeholder "installedTests"))
     (lib.mesonOption "libjack-path" "${placeholder "jack"}/lib")
     (lib.mesonEnable "echo-cancel-webrtc" (webrtc-audio-processings != [ ]))
-    (lib.mesonEnable "libcamera" true)
+    (lib.mesonEnable "libcamera" (lib.meta.availableOn stdenv.hostPlatform libcamera))
     (lib.mesonEnable "libffado" ffadoSupport)
     (lib.mesonEnable "roc" rocSupport)
     (lib.mesonEnable "libpulse" true)
···
     (lib.mesonEnable "gstreamer" true)
     (lib.mesonEnable "gstreamer-device-provider" true)
     (lib.mesonOption "logind-provider" (if enableSystemd then "libsystemd" else "libelogind"))
+    (lib.mesonEnable "logind" stdenv.hostPlatform.isLinux)
+    (lib.mesonEnable "selinux" stdenv.hostPlatform.isLinux)
+    (lib.mesonEnable "avb" stdenv.hostPlatform.isLinux)
+    (lib.mesonEnable "v4l2" stdenv.hostPlatform.isLinux)
+    (lib.mesonEnable "pipewire-v4l2" stdenv.hostPlatform.isLinux)
     (lib.mesonEnable "systemd" enableSystemd)
     (lib.mesonEnable "systemd-system-service" enableSystemd)
-    (lib.mesonEnable "udev" (!enableSystemd))
+    (lib.mesonEnable "udev" (!enableSystemd && stdenv.hostPlatform.isLinux))
     (lib.mesonEnable "ffmpeg" true)
     (lib.mesonEnable "pw-cat-ffmpeg" true)
-    (lib.mesonEnable "bluez5" true)
-    (lib.mesonEnable "bluez5-backend-hsp-native" true)
-    (lib.mesonEnable "bluez5-backend-hfp-native" true)
-    (lib.mesonEnable "bluez5-backend-native-mm" true)
-    (lib.mesonEnable "bluez5-backend-ofono" true)
-    (lib.mesonEnable "bluez5-backend-hsphfpd" true)
+    (lib.mesonEnable "bluez5" bluezSupport)
+    (lib.mesonEnable "bluez5-backend-hsp-native" bluezSupport)
+    (lib.mesonEnable "bluez5-backend-hfp-native" bluezSupport)
+    (lib.mesonEnable "bluez5-backend-native-mm" bluezSupport)
+    (lib.mesonEnable "bluez5-backend-ofono" bluezSupport)
+    (lib.mesonEnable "bluez5-backend-hsphfpd" bluezSupport)
     # source code is not easily obtainable
     (lib.mesonEnable "bluez5-codec-lc3plus" false)
-    (lib.mesonEnable "bluez5-codec-lc3" true)
-    (lib.mesonEnable "bluez5-codec-ldac" (lib.meta.availableOn stdenv.hostPlatform ldacbt))
+    (lib.mesonEnable "bluez5-codec-lc3" bluezSupport)
+    (lib.mesonEnable "bluez5-codec-ldac" (bluezSupport && ldacbtSupport))
     (lib.mesonEnable "opus" true)
     (lib.mesonOption "sysconfdir" "/etc")
     (lib.mesonEnable "raop" raopSupport)
···
     changelog = "https://gitlab.freedesktop.org/pipewire/pipewire/-/releases/${finalAttrs.version}";
     homepage = "https://pipewire.org/";
     license = licenses.mit;
-    platforms = platforms.linux;
+    platforms = platforms.linux ++ platforms.freebsd;
     maintainers = with maintainers; [
       kranzes
       k900