Use +(void)initialize method of the NSObject class.
Create classes FLWindowDelegateBefore10_6 and FLViewBefore10_6 to support text input before Mac OS 10.6

git-svn-id: http://seriss.com/public/fltk/fltk/branches/branch-1.3@10435 ea41ed52-d2ee-0310-a9c1-e6b18d33e121