setup_manpath

# File lib/bundler/runtime.rb, line 269
    def setup_manpath
      # Add man/ subdirectories from activated bundles to MANPATH for man(1)
      manuals = $LOAD_PATH.map do |path|
        man_subdir = path.sub(/lib$/, "man")
        man_subdir unless Dir[man_subdir + "/man?/"].empty?
      end.compact

      return if manuals.empty?
      Bundler::SharedHelpers.set_env "MANPATH", manuals.concat(
        ENV["MANPATH"].to_s.split(File::PATH_SEPARATOR)
      ).uniq.join(File::PATH_SEPARATOR)
    end