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-rw-r--r--pkgs/applications/window-managers/weston/default.nix8
1 files changed, 5 insertions, 3 deletions
diff --git a/pkgs/applications/window-managers/weston/default.nix b/pkgs/applications/window-managers/weston/default.nix
index a270bb8d466..c78f7d2d241 100644
--- a/pkgs/applications/window-managers/weston/default.nix
+++ b/pkgs/applications/window-managers/weston/default.nix
@@ -2,6 +2,7 @@
 , libXcursor, x11, udev, libdrm, mtdev, libjpeg, pam, dbus, libinput
 , pango ? null, libunwind ? null, freerdp ? null, vaapi ? null, libva ? null
 , libwebp ? null, xwayland ? null
+# beware of null defaults, as the parameters *are* supplied by callPackage by default
 }:
 
 let version = "1.6.0"; in
@@ -32,9 +33,10 @@ stdenv.mkDerivation rec {
     "--disable-setuid-install" # prevent install target to chown root weston-launch, which fails
   ] ++ stdenv.lib.optional (freerdp != null) "--enable-rdp-compositor"
     ++ stdenv.lib.optional (vaapi != null) "--enabe-vaapi-recorder"
-    ++ stdenv.lib.optional (xwayland != null) (
-        "--enable-xwayland " +
-        "--with-xserver-path=${xwayland}/bin/Xwayland");
+    ++ stdenv.lib.optionals (xwayland != null) [
+        "--enable-xwayland"
+        "--with-xserver-path=${xwayland}/bin/Xwayland"
+      ];
 
   meta = with stdenv.lib; {
     description = "Reference implementation of a Wayland compositor";