Amatch is a library for approximate string matching and searching in strings. Several algorithms can be used to do this, and it's also possible to compute a similarity metric number between 0.0 and 1.0 for two given strings. This is a workaround version to support Rubinius installation.
Gemfile gem 'amatch-rbx', '~> 0.2.12'
install gem install amatch-rbx