reverse-require allows one to require files that ends with a specified path from other RubyGems. For instance, if one wanted to require the file 'mylibrary/extensions.rb' from all RubyGems: require 'reverse_require' require_all 'mylibrary/extensions' # => true One can also require 'mylibrary/extensions.rb' only from RubyGems that depend on the currently loaded version of the mylibrary Gem: require_for 'mylibrary', 'mylibrary/extensions' # => true