diff -r 5bb080d35049 -r b87d8d4c205d configure.in
--- a/configure.in	Fri Aug 22 05:51:19 2003 +0000
+++ b/configure.in	Sat Aug 23 23:12:19 2003 +0000
@@ -553,7 +553,7 @@
         AC_PATH_X
         AC_PATH_XTRA
         if test x$have_x = xyes; then
-            CFLAGS="$CFLAGS $X_CFLAGS -DENABLE_X11 -I$srcdir/include -I$srcdir/src/video"
+            CFLAGS="$CFLAGS $X_CFLAGS -DENABLE_X11 -DXTHREADS -I$srcdir/include -I$srcdir/src/video"
             if test x$ac_cv_func_shmat != xyes; then
                 CFLAGS="$CFLAGS -DNO_SHARED_MEMORY"
             fi