I haven't tried building postgres with the Watcom compiler for 7.1 because

it does not support 64bit integers. AFAIK that's the default data type for
OIDs, so I am not surprised that this does not work. Use gcc instead.
BTW., 7.1 does not compile as is with gcc either, I believed the
required patches made it into the 7.1.1 release but obviously I missed
the deadline.
Since the ports mailing list does not seem to be archived I have attached
a copy of the patch (for 7.1 and 7.1.1).

I've just performed a build of a Watcom compiled version and found a couple
of bugs in the watcom specific part of that patch. Please use the attached
version instead.

Tegge, Bernd

src/backend/Makefile

@@ -4,7 +4,7 @@
 #
 # Copyright (c) 1994, Regents of the University of California
 #
-# $Header: /cvsroot/pgsql/src/backend/Makefile,v 1.71 2001/04/23 20:27:55 petere Exp $
+# $Header: /cvsroot/pgsql/src/backend/Makefile,v 1.72 2001/05/24 15:53:32 momjian Exp $
 #
 #-------------------------------------------------------------------------
 
@@ -25,7 +25,8 @@ OBJS := $(DIRS:%=%/SUBSYS.o)
 ifeq ($(PORTNAME), qnx4)
 # This file crashes qnx4's wlink and is therefore not in
 # bootstrap/SUBSYS.o on that platform. (Wotta hack ... is it still
-# necessary?)
+# necessary?) [ Yes, until the Watcom compiler goes open source it's
+# effectively unsupported ]
 OBJS+= bootstrap/bootstrap.o
 endif