anchor.diff:  
   buildGoPackage rec {
     name = "hub-${version}";
  -  version = "2.6.1";
  +  version = "2.7.0";
   
     goPackagePath = "github.com/github/hub";
   
  
positive.code:     owner = "github";
      repo = "hub";
      rev = "v${version}";
      sha256 = "1gq8nmzdsqicjgam3h48l0dad46dn9mx9blr1413rc2cp9qmg7d4";
    };
  
    nativeBuildInputs = [ groff ronn utillinux ];
  
negative.code:   postInstall = ''
      cd go/src/${goPackagePath}
      install -D etc/hub.zsh_completion "$bin/share/zsh/site-functions/_hub"
      install -D etc/hub.bash_completion.sh "$bin/share/bash-completion/completions/hub"
      install -D etc/hub.fish_completion  "$bin/share/fish/vendor_completions.d/hub.fish"
  
      make man-pages
  