This library generates and parses Universally Unique Identifier (UUID), based on OSSP uuid C library. So, libossp-uuid library is pre-required. OSSP uuid (http://www.ossp.org/pkg/lib/uuid/) is a ISO-C:1999 application programming interface (API) for the generation of DCE 1.1, ISO/IEC 11578:1996 and RFC 4122 compliant UUID. It supports DCE 1.1 variant UUIDs of version 1 (time and node based), version 3 (name based, MD5), version 4 (random number based) and version 5 (name based, SHA-1).
Gemfile gem 'uuid4r', '~> 0.1'
install gem install uuid4r -v 0.1