args @ { fetchurl, ... }:
rec {
  baseName = ''blackbird'';
  version = ''20160531-git'';

  description = ''A promise implementation for Common Lisp.'';

  deps = [ args."vom" ];

  src = fetchurl {
    url = ''http://beta.quicklisp.org/archive/blackbird/2016-05-31/blackbird-20160531-git.tgz'';
    sha256 = ''0l053fb5fdz1q6dyfgys6nmbairc3aig4wjl5abpf8b1paf7gzq9'';
  };

  overrides = x: {
    postInstall = ''
      find "$out/lib/common-lisp/" -name '*.asd' | grep -iv '/blackbird[.]asd${"$"}' |
        while read f; do
          CL_SOURCE_REGISTRY= \
          NIX_LISP_PRELAUNCH_HOOK="nix_lisp_run_single_form '(asdf:load-system :$(basename "$f" .asd))'" \
            "$out"/bin/*-lisp-launcher.sh ||
          mv "$f"{,.sibling}; done || true
    '';
  };
}
/* (SYSTEM blackbird DESCRIPTION A promise implementation for Common Lisp. SHA256 0l053fb5fdz1q6dyfgys6nmbairc3aig4wjl5abpf8b1paf7gzq9 URL
    http://beta.quicklisp.org/archive/blackbird/2016-05-31/blackbird-20160531-git.tgz MD5 5cb13dc06a0eae8dcba14714d2b5365d NAME blackbird TESTNAME NIL FILENAME
    blackbird DEPS ((NAME vom)) DEPENDENCIES (vom) VERSION 20160531-git SIBLINGS (blackbird-test)) */