anchor.diff:      version = 3;
       owner = "cpuguy83";
       repo = "go-md2man";
  -    rev = "v1.0.7";
  -    sha256 = "0inhyhb0ia3d018nq5lgayk9r0qa2x3g5wpsr7z0rh7sra1jiaks";
  +    rev = "1d903dcb749992f3741d744c0f8376b4bd7eb3e1";
  +    sha256 = "0l5fl6c8g5dnwklp8q6qp2n2s8r1zj7ssbw5h9k809nl82irbssi";
       propagatedBuildInputs = [
         blackfriday
       ];
  +    meta.useUnstable = true;
  +    date = "2017-08-27";
     };
   
     go-memdb = buildFromGitHub {
  
positive.code:     version = 3;
      owner = "russross";
      repo = "blackfriday";
      rev = "4048872b16cc0fc2c5fd9eacf0ed2c2fedaa0c8c";
      sha256 = "ddb0f4a4debe1ad4a210213c95fdf3c08cc21f18fd6a7cc3b76ed45228d57781";
      propagatedBuildInputs = [
        sanitized-anchor-name
      ];
      # V2 breaks goorgeus/go-md2man right now
      meta.autoUpdate = false;
    };
  
    blake2b-simd = buildFromGitHub {
  
negative.code:     version = 3;
      owner = "spf13";
      repo = "cobra";
      rev = "1be1d2841c773c01bee8289f55f7463b6e2c2539";
      sha256 = "0jcmkxw3kcg4n5093dpyx2rcwxbwawc6f98zf89d922bwkkkdszv";
      propagatedBuildInputs = [
        go-homedir
        go-md2man
  