anchor.diff:  }:
   
   let
  -  versionMajor = "1.9";
  -  versionMinor = "4";
  -  version = "${versionMajor}.${versionMinor}";
  +  channel = "1.9";
  +  version = "${channel}.4";
   in
   stdenv.mkDerivation rec {
     name = "libmediaart-${version}";
   
     src = fetchurl {
  -    url = "mirror://gnome/sources/libmediaart/${versionMajor}/${name}.tar.xz";
  +    url = "mirror://gnome/sources/libmediaart/${channel}/${name}.tar.xz";
       hashOutput = false;
       sha256 = "a57be017257e4815389afe4f58fdacb6a50e74fd185452b23a652ee56b04813d";
     };
  
positive.code:   nativeBuildInputs = [
      meson
      ninja
      #vala
    ];
  
    buildInputs = [
  
negative.code:         outputHash
          outputHashAlgo
          urls;
        fullOpts = {
          sha256Urls =
            map (u: lib.replaceStrings ["tar.xz"] ["sha256sum"] u) src.urls;
        };
        failEarly = true;
      };
    };
  