Define as 1 (one) as done by autoconf and the command line
	option, e.g. -DX11_t, not as empty.

	This avoids the gcc (3.4.6) warnings:
		../../libX11-1.1.5/src/x11_trans.c:27:1: warning: "X11_t" redefined
		<command line>:7:1: warning: this is the location of the previous definition
		../../libX11-1.1.5/src/x11_trans.c:28:1: warning: "TRANS_CLIENT" redefined
		<command line>:8:1: warning: this is the location of the previous definition

	Similarly, follow the autoconf convention to define XTHREADS
	and XUSE_MTSAFE_API as one.

	This avoids analogous warnings when compiling libXcomposite,
	libXcursor, and libXdamage.

	No reason to AC_SUBST XTHREADS and XUSE_MTSAFE_API (unused).

diff -ur libX11-1.1.5.orig/configure.ac libX11-1.1.5/configure.ac
--- libX11-1.1.5.orig/configure.ac	2008-09-04 23:38:59.000000000 +0200
+++ libX11-1.1.5/configure.ac	2008-10-07 14:35:37.000000000 +0200
@@ -168,17 +168,15 @@
 
 case x$xthreads in
 xyes)
-	AC_DEFINE(XTHREADS,[],[Whether libX11 is compiled with thread support])
+	AC_DEFINE(XTHREADS,1,[Whether libX11 is compiled with thread support])
 	if test x$mtsafeapi = xyes
 	then
-	AC_DEFINE(XUSE_MTSAFE_API,[],[Whether libX11 needs to use MT safe API's])
+	AC_DEFINE(XUSE_MTSAFE_API,1,[Whether libX11 needs to use MT safe API's])
 	fi
 	;;
 *)
 	;;
 esac
-AC_SUBST(XTHREADS)
-AC_SUBST(XUSE_MTSAFE_API)
 
 AC_CHECK_LIB(c, pthread_self, [thrstubs="no"], [thrstubs="yes"])
 AM_CONDITIONAL(THRSTUBS, test x$thrstubs = xyes)
diff -ur libX11-1.1.5.orig/src/x11_trans.c libX11-1.1.5/src/x11_trans.c
--- libX11-1.1.5.orig/src/x11_trans.c	2008-09-04 23:35:13.000000000 +0200
+++ libX11-1.1.5/src/x11_trans.c	2008-10-07 14:35:37.000000000 +0200
@@ -24,7 +24,7 @@
 #include "config.h"
 #endif
 
-#define X11_t
-#define TRANS_CLIENT
+#define X11_t 1
+#define TRANS_CLIENT 1
 #include <X11/Xtrans/transport.c>