git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@31201 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merges r30741 from trunk into ruby_1_9_2.¶
Gem might be undefined if --disable-gems. [ruby-core:34990]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@31201 b2dd03c8-39d4-4d8f-98ff-823fe69b080e