plasma5Packages.kimageformats: enable HEIF/HEIC

pkgs/development/libraries/kde-frameworks/kimageformats.nix

@@ -1,7 +1,7 @@
 {
   mkDerivation, lib,
   extra-cmake-modules,
-  ilmbase, karchive, openexr, libavif, qtbase
+  ilmbase, karchive, openexr, libavif, libheif, qtbase
 }:
 
 let inherit (lib) getDev; in
@@ -10,9 +10,12 @@ mkDerivation {
   pname = "kimageformats";
 
   nativeBuildInputs = [ extra-cmake-modules ];
-  buildInputs = [ karchive openexr libavif qtbase ];
+  buildInputs = [ karchive openexr libavif libheif qtbase ];
   outputs = [ "out" ]; # plugins only
   CXXFLAGS = "-I${getDev ilmbase}/include/OpenEXR";
+  cmakeFlags = [
+    "-DKIMAGEFORMATS_HEIF=ON"
+  ];
 
   meta = with lib; {
     broken = versionOlder qtbase.version "5.14";