From owner-freebsd-ppc@FreeBSD.ORG  Fri Nov  9 04:35:44 2007
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Date: Thu, 08 Nov 2007 20:34:29 -0800
From: Peter Grehan <grehan@freebsd.org>
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Cc: freebsd-ppc@freebsd.org
Subject: Re: xorg-server 1.4_2,1 fails on RELENG_7
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Last change to get a clean xorg build:

--- work/xorg-server-1.4/hw/xfree86/os-support/bsd/ppc_video.c.orig 
2007-11-09 02:58:11.000000000 +0000
+++ work/xorg-server-1.4/hw/xfree86/os-support/bsd/ppc_video.c 
2007-11-09 03:00:09.000000000 +0000
@@ -164,7 +164,11 @@

          if (ioBase != MAP_FAILED)
          {
+#if defined(__FreeBSD__)
+               munmap(__DEVOLATILE(unsigned char *, ioBase), 0x10000);
+#else
                  munmap(__UNVOLATILE(ioBase), 0x10000);
+#endif
                  ioBase = MAP_FAILED;
          }
  }

Based on my last X experience, it is unlikely to work but getting a 
build is a step in the right direction.

later,

Peter.