anchor.diff:  , qtsvg
   
   , exiv2
  -, opencv
  +, opencv4
   , libraw
   , libtiff
   , quazip
  
positive.code:                  qttools
                   qtsvg
                   exiv2
                   opencv
                   libraw
                   libtiff
                   quazip];
  
negative.code: { stdenv
  , mkDerivation
  , fetchFromGitHub
  , fetchpatch
  , cmake
  , pkgconfig
  
  