anchor.diff:  
     bibletime = callPackage ../applications/misc/bibletime { };
   
  -  bitkeeper = callPackage ../applications/version-management/bitkeeper { };
  +  bitkeeper = callPackage ../applications/version-management/bitkeeper {
  +    gperf = gperf_3_0;
  +  };
   
     bitlbee = callPackage ../applications/networking/instant-messengers/bitlbee { };
     bitlbee-plugins = callPackage ../applications/networking/instant-messengers/bitlbee/plugins.nix { };
  
positive.code:   # On non-GNU systems we need GNU Gettext for libintl.
    libintlOrEmpty = stdenv.lib.optional (!stdenv.isLinux) gettext;
  
    libid3tag = callPackage ../development/libraries/libid3tag { };
  
    libidn = callPackage ../development/libraries/libidn { };
  
  
negative.code: 
    jenkins-job-builder = pythonPackages.jenkins-job-builder;
  
    kconfig-frontends = callPackage ../development/tools/misc/kconfig-frontends {
      gperf = gperf_3_0;
    };
  
    kcov = callPackage ../development/tools/analysis/kcov { };
  
  