let
        srcInfo = pkg.target.${hostTripleOf stdenv.system} or pkg.target."*";
        version' = builtins.match "([^ ]*) [(]([^ ]*) ([^ ]*)[)]" pkg.version;
        version = "${elemAt version' 0}-${elemAt version' 2}-${elemAt version' 1}";
        warn = builtins.trace "SRCINFO ${srcInfo}" true;
      in
        warn
        stdenv.mkDerivation {
          name = name + "-" + version;
          src = fetchurl {
            url = srcInfo.url;
            sha256 = srcInfo.hash;
          };