anchor.diff:  
   buildGoPackage rec {
     name = "keybase-${version}";
  -  version = "1.0.27";
  +  version = "1.0.28";
   
     goPackagePath = "github.com/keybase/client";
     subPackages = [ "go/keybase" ];
  
positive.code:     owner  = "keybase";
      repo   = "client";
      rev    = "v${version}";
      sha256 = "0s68awgaq32hl5rvcrnhn9i98dwh23kws0l4czcghyn6imx8h89i";
    };
  
    buildFlags = [ "-tags production" ];
  
negative.code:     homepage = https://www.keybase.io/;
      description = "The Keybase official command-line utility and service.";
      platforms = platforms.linux;
      maintainers = with maintainers; [ carlsverre np rvolosatovs ];
    };
  }
  