I noticed that sq.h is taken from the build dir hierarchy, by the way, so it's not entirely consistent...

I think that's the proper location to grab this file from. The sq.h in the Cross-platform directory probably shouldn't even be there, really.

My understanding is:

src - holds stuff generated by Squeak Cross - holds stuff that all platofrms can use, that wasn't automatically generated unix - holds Unix-specific stuff

Actually, though, src ends up combining all three, the way VMMaker works. This combining behavior seems to be a little tricky to get just right, however....

Or at least I don't understand what is pulled from where, exactly. And I get warnings about duplicate rules in the Makefile.

Could you try deleting platfoms/Cross/SurfacePlugin/SurfacePlugin.c, running configure again, and seeing if the errors go away?

I'm not courageous enough to dive into this autoconf/Makefile stuff to find out why or do something against it, though...

I hear you! autoconf stuff is a mess even at its best!

However, I have attached a new version of sqUnixMemory.c, which removes a few pointer/int cast compiler warnings. Briefly tested with/without mmap enabled.

Awesome, those are annoying! I've uploaded your version now, along with some small changes to sqPlatformSpecific.h I'm sure you made.

-Lex