Modified extconf.rb
Modified extconf.rb

git-svn-id: 38c604b3104e32f2a99bb63601c3e294170c19ce@32 425b54fa-293c-0410-bdda-a7e424c12f17

IceDragon200/starruby,hajimehoshi/starruby,hajimehoshi/starruby,IceDragon200/starruby,IceDragon200/starruby,IceDragon200/starruby