anchor.diff:    inherit (lib)
       boolEn;
   
  -  versionMajor = "0.17";
  -  versionMinor = "9";
  -  version = "${versionMajor}.${versionMinor}";
  +  channel = "0.17";
  +  version = "${channel}.9";
   in
   stdenv.mkDerivation rec {
     name = "libgdata-${version}";
   
     src = fetchurl {
  -    url = "mirror://gnome/sources/libgdata/${versionMajor}/${name}.tar.xz";
  +    url = "mirror://gnome/sources/libgdata/${channel}/${name}.tar.xz";
       hashOutput = false;
       sha256 = "85c4f7674c0098ffaf060ae01b6b832cb277b3673d54ace3bdedaad6b127453a";
     };
  
positive.code:         outputHash
          outputHashAlgo
          urls;
        sha256Url = "https://download.gnome.org/sources/libgdata/${versionMajor}/"
          + "${name}.sha256sum";
        failEarly = true;
      };
    };
  
negative.code: , gobject-introspection
  , liboauth
  , libsoup
  , vala
  }:
  
  