anchor.diff:      wrapProgram "$out/bin/redshift-gtk" \
         --prefix PYTHONPATH : "$PYTHONPATH" \
         --prefix GI_TYPELIB_PATH : "$GI_TYPELIB_PATH" \
  -      --prefix XDG_DATA_DIRS : "$out/share"
  +      --prefix XDG_DATA_DIRS : "$out/share:${hicolor_icon_theme}/share"
     '';
   
     meta = with stdenv.lib; {
  
positive.code: { fetchurl, stdenv, gettext, intltool, makeWrapper, pkgconfig
  , geoclue
  , guiSupport ? true, gtk3, python, pygobject3, pyxdg
  , drmSupport ? true, libdrm
  , randrSupport ? true, libxcb
  , vidModeSupport ? true, libX11, libXxf86vm
  
negative.code:   };
  
    buildInputs = [ geoclue ]
      ++ stdenv.lib.optionals guiSupport [ hicolor_icon_theme gtk3 python pygobject3 pyxdg ]
      ++ stdenv.lib.optionals drmSupport [ libdrm ]
      ++ stdenv.lib.optionals randrSupport [ libxcb ]
      ++ stdenv.lib.optionals vidModeSupport [ libX11 libXxf86vm ];
  