anchor.diff:  { lib, stdenv, fetchFromGitHub, pkg-config, autoreconfHook, makeWrapper
   , runCommandCC, runCommand, vapoursynth, writeText, patchelf, buildEnv
  -, zimg, libass, python3, libiconv
  +, zimg, libass, python3, libiconv, testers
   , ApplicationServices
   }:
   
  
positive.code:       inherit lib python3 buildEnv writeText runCommandCC stdenv runCommand
          vapoursynth makeWrapper withPlugins;
      };
    };
  
    postInstall = ''
  
negative.code:     license     = licenses.lgpl21;
      platforms   = platforms.x86_64;
      maintainers = with maintainers; [ rnhmjoj sbruder tadeokondrak ];
      mainProgram = "vspipe";
    };
  }
  