anchor.diff:        inherit lib python3 buildEnv writeText runCommandCC stdenv runCommand
           vapoursynth makeWrapper withPlugins;
       };
  +
  +    tests.version = testers.testVersion {
  +      package = vapoursynth;
  +      # Check Core version to prevent false positive with API version
  +      version = "Core R${version}";
  +    };
     };
   
     postInstall = ''
  
positive.code:     license     = licenses.lgpl21;
      platforms   = platforms.x86_64;
      maintainers = with maintainers; [ rnhmjoj sbruder tadeokondrak ];
    };
  }
  
negative.code: { lib, stdenv, fetchFromGitHub, pkg-config, autoreconfHook, makeWrapper
  , runCommandCC, runCommand, vapoursynth, writeText, patchelf, buildEnv
  , zimg, libass, python3, libiconv, testers
  , ApplicationServices
  }:
  
  