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From: swick@ATHENA.MIT.EDU (Ralph R. Swick)
Newsgroups: comp.windows.x
Subject: Re: Xt unportability??!
Message-ID: <9007162137.AA00125@lyre.MIT.EDU>
Date: 16 Jul 90 21:37:28 GMT
References: <9007162115.AA05514@ATHENA.MIT.EDU>
Sender: daemon@athena.mit.edu (Mr Background)
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    On the other hand, I can't believe that someone wouldn't have seen this
    already if this were actually a problem.

Correct.  This was a problem in R3.  In R4, it all hinges on whether
or not Xlib was built correctly.  See MALLOC_0_RETURNS_NULL in
lib/X/Xlibos.h and look at (e.g.) config/sgi.cf