anchor.diff:  { stdenv
  +, mkDerivation
   , fetchFromGitHub
   , cmake
   , pkgconfig
  -, wrapGAppsHook
  -, gsettings-desktop-schemas
   
   , qtbase
   , qttools
  
positive.code:                  opencv
                   libraw
                   libtiff
                   quazip
                   gsettings-desktop-schemas];
  
    cmakeFlags = ["-DENABLE_OPENCV=ON"
                  "-DENABLE_RAW=ON"
  
negative.code:   '';
  
    nativeBuildInputs = [cmake
                         pkgconfig];
  
    buildInputs = [qtbase
                   qttools
  