anchor.diff:  
   leptonica = callPackage ../all-pkgs/l/leptonica { };
   
  +letskencrypt = callPackage ../all-pkgs/l/letskencrypt { };
  +
   leveldb = callPackage ../all-pkgs/l/leveldb { };
   
  -letskencrypt = callPackage ../all-pkgs/l/letskencrypt { };
  -
   lftp = callPackage ../all-pkgs/l/lftp { };
   
   lib-bash = callPackage ../all-pkgs/l/lib-bash { };
  
positive.code: 
  mtdev = callPackage ../all-pkgs/m/mtdev { };
  
  mtr = callPackage ../all-pkgs/m/mtr { };
  
  mtools = callPackage ../all-pkgs/m/mtools { };
  
  inherit (callPackages ../all-pkgs/m/mumble {
    jackSupport = config.jack or false;
  
negative.code: swig_2 = callPackageAlias "swig" {
    channel = "2";
  };
  swig_3 = callPackageAlias "swig" {
    channel = "3";
  };
  swig = callPackage ../all-pkgs/s/swig { };
  
  sydent = pkgs.python2Packages.sydent;
  