class PackageConfig

def compute_native_pkg_config_prefix
  pkg_config = native_pkg_config
  return nil unless pkg_config.absolute?
  return nil unless pkg_config.exist?
  pkg_config_prefix = pkg_config.parent.parent
  if File::ALT_SEPARATOR
    normalized_pkg_config_prefix =
      pkg_config_prefix.to_s.split(File::ALT_SEPARATOR).join(File::SEPARATOR)
    Pathname(normalized_pkg_config_prefix)
  else
    pkg_config_prefix
  end
end