anchor.diff:      description = "Virtual lighttable and darkroom for photographers";
       homepage = https://www.darktable.org;
       license = licenses.gpl3Plus;
  -    platforms = platforms.linux;
  +    platforms = platforms.linux ++ platforms.darwin;
       maintainers = with maintainers; [ goibhniu rickynils flosse mrVanDalo ];
     };
   }
  
positive.code: , ilmbase, gtk3, intltool, lcms2, lensfun, libX11, libexif, libgphoto2, libjpeg
  , libpng, librsvg, libtiff, openexr, osm-gps-map, pkgconfig, sqlite, libxslt
  , openjpeg, lua, pugixml, colord, colord-gtk, libwebp, libsecret, gnome3
  , ocl-icd
  }:
  
  stdenv.mkDerivation rec {
  
negative.code:   nativeBuildInputs = [ cmake ninja llvm pkgconfig intltool perl desktop-file-utils wrapGAppsHook ];
  
    buildInputs = [
      cairo curl exiv2 glib gtk3 ilmbase lcms2 lensfun libexif
      libgphoto2 libjpeg libpng librsvg libtiff openexr sqlite libxslt
      libsoup graphicsmagick json-glib openjpeg lua pugixml
      libwebp libsecret gnome3.adwaita-icon-theme osm-gps-map pcre
    ] ++ stdenv.lib.optionals stdenv.isLinux [
      colord colord-gtk libX11 ocl-icd
    ] ++ stdenv.lib.optional stdenv.isDarwin gtk-mac-integration;
  
    cmakeFlags = [
      "-DBUILD_USERMANUAL=False"
    ] ++ stdenv.lib.optionals stdenv.isDarwin [
      "-DUSE_COLORD=OFF"
      "-DUSE_KWALLET=OFF"
    ];
  
  
    # darktable changed its rpath handling in commit
    # 83c70b876af6484506901e6b381304ae0d073d3c and as a result the
    # binaries can't find libdarktable.so, so change LD_LIBRARY_PATH in
    # the wrappers:
    preFixup = let
      libPathEnvVar = if stdenv.isDarwin then "DYLD_LIBRARY_PATH" else "LD_LIBRARY_PATH";
      libPathPrefix = "$out/lib/darktable" + stdenv.lib.optionalString stdenv.isLinux ":${ocl-icd}/lib";
    in ''
      gappsWrapperArgs+=(
        --prefix ${libPathEnvVar} ":" "${libPathPrefix}"
      )
    '';
  
  