gem extensions
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55950 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
gem extensions
extension directories. [ruby-core:76931] [Bug #12681]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55950 b2dd03c8-39d4-4d8f-98ff-823fe69b080e