merge revision(s) 37242: [Backport #7120]
* configure.in (opt-dir): allow multiple directories separated by $PATH_SEPARATOR as well as dir_config in mkmf.rb. [ruby-core:47868] [Bug #7120]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@37266 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 37242: [Backport #7120]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@37266 b2dd03c8-39d4-4d8f-98ff-823fe69b080e