anchor.diff:    };
   
     swift = buildFromGitHub {
  -    version = 2;
  -    rev = "8e9b10220613abdbc2896808ee6b43e411a4fa6c";
  +    version = 3;
  +    rev = "bf51ccd3b5c3a1f12ac762b4511c5f9f1ce6b26f";
       owner  = "ncw";
       repo   = "swift";
  -    sha256 = "0rp54ghj07dvb6501kvhijq8cnl72k6m99baxqk7jjda8fd2kk0r";
  -    date = "2017-03-15";
  +    sha256 = "0jrxn0jnihlxsqphkbz02w6d7386na8f6dhraak8dskb9pj4grzx";
  +    date = "2017-05-16";
     };
   
     anacrolix_sync = buildFromGitHub {
  
positive.code:     version = 3;
      owner = "streadway";
      repo = "amqp";
      rev = "3ecc4964a725c5a63855a7d939ec011d024b84bf";
      date = "2017-05-12";
      sha256 = "0mwggmslq1k8nf5wad57ci6vgf87nhcfx94k02nc0bvlgqndj7iz";
    };
  
    ansi = buildFromGitHub {
  
negative.code:       purgeTimestamps = true;
        inherit name;
        url = "https://code.googlesource.com/google-api-go-client/+archive/${rev}.tar.gz";
        sha256 = "1n12hl98bnf3rmj4j2fc9ggpzqbln6zm8agisb9ipwdy3ihyjfln";
      };
      buildInputs = [
        appengine
  