apple's objc runtime on linux?

[Benhur Stein]

Hi!

With the discussion on unifying the runtimes, I wanted to do some 
comparisions on apple's and
gnu's objc runtimes. I've tried to compile apple's runtime on linux, 
but it has some dependencies
on some external files (I just took the objc4 package from apple, 
uncompressed and did a make
that complained on many files, I did not dig any further).
So, my question is, has anybody had success in compiling (and 
running) apple's runtime on linux?
What is needed?

Thanks,
Benhur