where can I find col.h?
google is no help, it gives a bunch of nonsense results like "Lt Col H Jones Vc Obe | War Imperial War Museums"
LOL, too funny!!
libcol (Cocoa Objects Library) is a library that I created but haven't released to the general public.
I've attached an installer package that you can use (built on Sierra, so no guarantees that it will work on anything older. I generally go back two OS versions only).
You'll need to do a git pull to get the updated cocoa.inc file, I had to make a minor tweak in it.
AIR.