anchor.diff:      inherit rev;
       owner = "prometheus";
       repo = "alertmanager";
  -    sha256 = "1z0f8jqbd4v00634qcs41h1zb70ahl63svlzn33gavripk84hwzq";
  +    sha256 = "04969hqig0llfkvk3b0yqrywcxm6rgd7ph6nn5rx8pnq21i77sqm";
     };
   
     # Tests exist, but seem to clash with the firewall.
  
positive.code:        -X ${t}.GoVersion=${stdenv.lib.getVersion go}
    '';
  
    meta = with stdenv.lib; {
      description = "Alert dispatcher for the Prometheus monitoring system";
      homepage = https://github.com/prometheus/alertmanager;
  
negative.code: 
  buildGoPackage rec {
    name = "alertmanager-${version}";
    version = "0.6.0";
    rev = "v${version}";
  
    goPackagePath = "github.com/prometheus/alertmanager";
  