--- mit-pthreads/machdep/freebsd-2.0/__unistd.h.orig	Wed Mar 26 15:26:39 1997
+++ mit-pthreads/machdep/freebsd-2.0/__unistd.h	Tue Sep  1 10:59:22 1998
@@ -52,8 +52,12 @@
 #define	_POSIX_SAVED_IDS	/* saved set-user-ID and set-group-ID */
 #endif
 
+#ifndef _POSIX_VERSION
 #define	_POSIX_VERSION		198808L
+#endif
+#ifndef _POSIX2_VERSION
 #define	_POSIX2_VERSION		199212L
+#endif
 
 /* execution-time symbolic constants */
 				/* chown requires appropriate privileges */