I have a Mac keyboard layout available as well as an updated Installation Guide. May I suggest that a new folder be created in /support-files named OS X-keyboard?
The Guide provides manual instructions on how to install it - a simple drag and drop to either /Library/Keyboard Layouts or preferably ~/Library/Keyboard Layouts. I suppose it could be done automatically with make files but I have no expertise in this area. The only thing I question is the duplication of the ⍙ glyph in Alt+Shift+h and Alt+Shit+b. This is to follow what ]keyb displays. But I am curious why it is duplicated. IMO the Alt+Shit+h is the proper place since Alt+h is ∆. If you agree and want the Alt+Shift+b glyph removed I will do so on the Mac layout. Then I can forward these two items to you for inclusion or update to 1.4 at the next minor revision. respect…. Peter