anchor.diff:      repo = "zappy";
       sha256 = "1kinbjs95hv16kn4cgm3vb1yzv09ina7br5m3ygh803qzxp7i5jz";
     };
  -
  -  ninefans = buildFromGitHub {
  -    rev = "0.0.0";
  -    date   = "2015-10-24";
  -    owner  = "9fans";
  -    repo   = "go";
  -    sha256 = "0kzyxhs2xf0339nlnbm9gc365b2svyyjxnr86rphx5m072r32ims";
  -    goPackagePath = "9fans.net/go";
  -    goPackageAliases = [
  -      "github.com/9fans/go"
  -    ];
  -    excludedPackages = "\\(plan9/client/cat\\|acme/Watch\\)";
  -    buildInputs = [ net ];
  -  };
  -
  -  godef = buildFromGitHub {
  -    rev = "0.0.0";
  -    date   = "2015-10-24";
  -    owner  = "rogpeppe";
  -    repo   = "godef";
  -    sha256 = "1wkvsz8nqwyp36wbm8vcw4449sfs46894nskrfj9qbsrjijvamyc";
  -    excludedPackages = "\\(go/printer/testdata\\)";
  -    buildInputs = [ ninefans ];
  -    subPackages = [ "./" ];
  -  };
  -
  -  godep = buildFromGitHub {
  -    rev = "0.0.0";
  -    date   = "2015-10-15";
  -    owner  = "tools";
  -    repo   = "godep";
  -    sha256 = "0zc1ah5cvaqa3zw0ska89a40x445vwl1ixz8v42xi3zicx16ibwz";
  -  };
  -
  -  color = buildFromGitHub {
  -    rev = "0.0.0";
  -    owner    = "fatih";
  -    repo     = "color";
  -    sha256   = "1vjcgx4xc0h4870qzz4mrh1l0f07wr79jm8pnbp6a2yd41rm8wjp";
  -    propagatedBuildInputs = [ net go-isatty ];
  -    buildInputs = [ ansicolor go-colorable ];
  -  };
  -
  -  pup = buildFromGitHub {
  -    rev = "0.0.0";
  -    owner    = "EricChiang";
  -    repo     = "pup";
  -    sha256   = "04j3fy1vk6xap8ad7k3c05h9b5mg2n1vy9vcyg9rs02cb13d3sy0";
  -    propagatedBuildInputs = [ net ];
  -    buildInputs = [ go-colorable color ];
  -    postPatch = ''
  -      grep -sr github.com/ericchiang/pup/Godeps/_workspace/src/ |
  -        cut -f 1 -d : |
  -        sort -u |
  -        xargs -d '\n' sed -i -e s,github.com/ericchiang/pup/Godeps/_workspace/src/,,g
  -    '';
  -  };
  -
  -  textsecure = buildFromGitHub rec {
  -    rev = "0.0.0";
  -    owner = "janimo";
  -    repo = "textsecure";
  -    sha256 = "0sdcqd89dlic0bllb6mjliz4x54rxnm1r3xqd5qdp936n7xs3mc6";
  -    propagatedBuildInputs = [ crypto protobuf ed25519 yaml-v2 logrus ];
  -  };
  -
  -  interlock = buildFromGitHub rec {
  -    version = "2016.01.14";
  -    rev = "0.0.0";
  -    owner = "inversepath";
  -    repo = "interlock";
  -    sha256 = "0wabx6vqdxh2aprsm2rd9mh71q7c2xm6xk9a6r1bn53r9dh5wrsb";
  -    buildInputs = [ crypto textsecure ];
  -    nativeBuildInputs = [ pkgs.sudo ];
  -    buildFlags = [ "-tags textsecure" ];
  -    subPackages = [ "./cmd/interlock" ];
  -    postPatch = ''
  -      grep -lr '/s\?bin/' | xargs sed -i \
  -        -e 's|/bin/mount|${pkgs.utillinux}/bin/mount|' \
  -        -e 's|/bin/umount|${pkgs.utillinux}/bin/umount|' \
  -        -e 's|/bin/cp|${pkgs.coreutils}/bin/cp|' \
  -        -e 's|/bin/mv|${pkgs.coreutils}/bin/mv|' \
  -        -e 's|/bin/chown|${pkgs.coreutils}/bin/chown|' \
  -        -e 's|/bin/date|${pkgs.coreutils}/bin/date|' \
  -        -e 's|/sbin/poweroff|${pkgs.systemd}/sbin/poweroff|' \
  -        -e 's|/usr/bin/sudo|/var/setuid-wrappers/sudo|' \
  -        -e 's|/sbin/cryptsetup|${pkgs.cryptsetup}/bin/cryptsetup|'
  -    '';
  -  };
   }; in self
  
positive.code: 
      nativeBuildInputs = [ pkgs.pkgconfig ];
      buildInputs = [ pkgs.libusb1 ];
    };
  
    pborman_uuid = buildFromGitHub {
  
negative.code:     goPackagePath = "gopkg.in/mgo.v2";
      goPackageAliases = [ "github.com/go-mgo/mgo" ];
      buildInputs = [ pkgs.cyrus-sasl tomb ];
    };
  
    missinggo = buildFromGitHub {
      rev = "c49275eaef9c8b81592331bbd4c32ad6329e701c";
      owner  = "anacrolix";
      repo   = "missinggo";
      sha256 = "0vc1xcgvbwfnwplp36qfa099c0bcpi5d441q28xiy8d5ig1sdpdq";
      date = "2016-04-30";
      propagatedBuildInputs = [
        b
        btree
        docopt-go
        goskiplist
        iter
        roaring
      ];
    };
  
    mmark = buildFromGitHub {
  