anchor.diff:    };
   
     gx-go = buildFromGitHub {
  -    rev = "v1.2.0";
  +    rev = "v1.2.1";
       owner = "whyrusleeping";
       repo = "gx-go";
  -    sha256 = "008yfrax1kd9r63rqdi9fcqhy721bjq63d4ypm5d4nn0fbychg4s";
  +    sha256 = "1rqwr7hsa3ifrp33s5v3mwl9yjmlqs9iciidibjigmlffkzzxhv9";
       buildInputs = [
         urfave_cli
         fs
  
positive.code: 
    tagflag = buildFromGitHub {
      rev = "e7497e81ffa475caf0fc24e999eb29edc0335040";
      date = "2016-06-16";
      owner  = "anacrolix";
      repo   = "tagflag";
      sha256 = "0w14w9xv7j1y8a19mb3jsqb5fm50nr50fdjh59h3bavx2vvn9caw";
      propagatedBuildInputs = [
        go-humanize
        missinggo_lib
        xstrings
      ];
    };
  
    tar-utils = buildFromGitHub {
  
negative.code:     sha256 = "1bkvi5l2sshjrg1g9x1a4i337adrv1vhk8p1xrkx5z05nfwazvx0";
    };
  
    go-os-rename = buildFromGitHub {
      rev = "3ac97f61ef67a6b87b95c1282f6c317ed0e693c2";
      owner  = "jbenet";
      repo   = "go-os-rename";
      sha256 = "0y8rq0y654lcyl7ysijni75j8fpq4hhqnh9qiy2z4hvmnzvb85id";
      date = "2015-04-28";
    };
  
    go-plugin = buildFromGitHub {
      rev = "8cf118f7a2f0c7ef1c82f66d4f6ac77c7e27dc12";
      date = "2016-06-07";
  