If dev-ruby/ffi is not installed: /usr/lib64/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:45:in `require': cannot load such file -- ffi (LoadError) from /usr/lib64/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:45:in `require' from /usr/lib64/ruby/gems/1.9.1/gems/magic-0.2.8/lib/magic.rb:3:in `<top (required)>' If dev-ruby/ffi is installed, everything works. Also see https://github.com/qoobaa/magic/blob/master/lib/magic.rb#l3
15 Jun 2014; Manuel Rüger <mrueg@gentoo.org> -magic-0.2.6_p20130813.ebuild, magic-0.2.8.ebuild: Add missing dependency on ruby-ffi. Fixes bug #513318. Cleanup old.