OT: OS/X - X11

[John Allain]

I attended a presentation at AppleNYC last night to oogle all
the neat hardware and hear about the Software but I failed to
ask this question:
   Can you take an X11 application compiled for PPC/linux or
    /freeBSD and run it on the Mac?

Think they said that their OS was Posix compliant but apps
were'nt portable To other platforms.  But From?

I've seen a few X11 crashes in my day but I'll still give 'em
a chance.

John A.