anchor.diff:      sha256 = "0sjni0qz026xr4q04j0dzi0jnxnipm86qpic9l4wmxcf2q0bzx1y";
     };
   
  +  pfilter = buildFromGitHub {
  +    version = 2;
  +    owner = "AudriusButkevicius";
  +    repo = "pfilter";
  +    rev = "09b3cfdd04de89f0196caecb0b335d7149a6593a";
  +    date = "2017-02-09";
  +    sha256 = "1p57lgdsssvl6s0jsf6ggh20z4rj06scnjr5cilp1jpjgrc87xzs";
  +  };
  +
     pflag = buildFromGitHub {
       version = 2;
       owner = "spf13";
  
positive.code:       go-deadlock
        go-lz4
        go-nat-pmp
        gogo_protobuf
        goleveldb
        groupcache
        luhn
        net
        osext
        pq
        qart
        ql
        rcrowley_go-metrics
        rollinghash
        sha256-simd
        suture
        text
        time
  
negative.code:     ];
    };
  
    go-stun = buildFromGitHub {
      version = 2;
      rev = "04a4eed61c57ecc9903f8983d1d2c17b88d2e9e1";
      owner  = "ccding";
      repo   = "go-stun";
      sha256 = "1sadm5cr2108z25glyvsdkkxf8pr0jis67vyv56bbk01bqpvgkql";
      date = "2017-03-23";
    };
  
    go-syslog = buildFromGitHub {
      version = 2;
      date = "2016-12-13";
  