docs: def slack_package(prgnam):
      """Return maximum binary Slackware package from output directory
      """
      binaries, cache, binary = [], "0", ""
      for pkg in find_package(prgnam, _meta_.output):
          if pkg.startswith(prgnam) and pkg[:-4].endswith("_SBo"):
              binaries.append(pkg)
      for bins in binaries:
          if LooseVersion(bins) > LooseVersion(cache):
              binary = bins
              cache = binary
      if not binary:
          Msg().build_FAILED(prgnam)
          raise SystemExit(1)
      return ["".join(_meta_.output + binary)]