XNS on Ultrix 3.1

[James Matthew Van Vorst]

Does anyone out there have experience with XNS running on Ultrix 3.1?  Xerox
tried to put XNS on our Ultrix system and it wouldn't compile.  They said
it was because Ultrix wasn't 4.3BSD compatable.  DEC says it is.  Xerox says
the cc compiler on 3.1 is screwey, that it doesn't have all the necessary
librarys and such.  DEC says that they took it straight from their 4.3BSD tape 
and that Xerox's source is buggy.  Apparently this particular implementation
of XNS was developed on Sun OS, which has some non-BSD extensions.  So who's
right?  Is Ultrix truly BSD compatible and XNS isn't or vice-versa?  

			Thanks in advance,
			Jim Van Vorst (McDonnell Douglas - Huntington Beach)