Gemfile in mittsu-opengl-0.5.0 vs Gemfile in mittsu-opengl-0.5.1

@@ -1,9 +1,5 @@
 source 'https://rubygems.org'
 
 gemspec
 
 gem 'mittsu', path: '../mittsu'
-
-if /darwin/ === RUBY_PLATFORM
-  gem 'ffi', '~> 1.9', '!= 1.11.1'
-end