openshot-qt: enable on darwin

pkgs/applications/video/openshot-qt/default.nix

@@ -1,6 +1,7 @@
 { stdenv, mkDerivationWith, fetchFromGitHub, fetchpatch
 , doxygen, python3Packages, libopenshot
-, wrapGAppsHook, gtk3 }:
+, wrapGAppsHook, gtk3
+, qtsvg }:
 
 mkDerivationWith python3Packages.buildPythonApplication rec {
   pname = "openshot-qt";
@@ -29,6 +30,12 @@ mkDerivationWith python3Packages.buildPythonApplication rec {
 
   postFixup = ''
     wrapProgram $out/bin/openshot-qt \
+  ''
+  # Fix toolbar icons on Darwin
+  + stdenv.lib.optionalString stdenv.isDarwin ''
+      --suffix QT_PLUGIN_PATH : "${stdenv.lib.getBin qtsvg}/lib/qt-5.12.7/plugins" \
+  ''
+  + ''
       "''${gappsWrapperArgs[@]}" \
       "''${qtWrapperArgs[@]}"
   '';
@@ -47,6 +54,6 @@ mkDerivationWith python3Packages.buildPythonApplication rec {
     '';
     license = with licenses; gpl3Plus;
     maintainers = with maintainers; [ AndersonTorres ];
-    platforms = with platforms; linux;
+    platforms = with platforms; unix;
   };
 }