anchor.diff:  
     gammastep = mkRedshift rec {
       pname = "gammastep";
  -    version = "2.0.5";
  +    version = "2.0.6";
   
       src = fetchFromGitLab {
         owner = "chinstrap";
         repo = pname;
         rev = "v${version}";
  -      sha256 = "1l3x4gnichwzbb0529bhm723xpryn5svhhsfdiwlw122q1vmz2q7";
  +      sha256 = "00s457yajnm7vq6jfanyri52pq000jbyjiy6wz2i3f0rq7cc01ya";
       };
   
       meta = redshift.meta // {
  
positive.code: , withGeolocation ? true
  , withCoreLocation ? withGeolocation && stdenv.isDarwin, CoreLocation, Foundation, Cocoa
  , withGeoclue ? withGeolocation && stdenv.isLinux, geoclue
  , withAppIndicator ? true, libappindicator
  }:
  
  let
  
negative.code:         ++ stdenv.lib.optional  withDrm          libdrm
          ++ stdenv.lib.optional  withQuartz       ApplicationServices
          ++ stdenv.lib.optionals withCoreLocation [ CoreLocation Foundation Cocoa ]
          ++ stdenv.lib.optional  withAppIndicator (if (pname != "gammastep")
               then libappindicator
               else libayatana-appindicator)
          ;
  
        pythonPath = [ pygobject3 pyxdg ];
  