diff --git a/src/libdraw/mkwsysrules.sh b/src/libdraw/mkwsysrules.sh
index 9d7f4b9a..290cbc91 100644
--- a/src/libdraw/mkwsysrules.sh
+++ b/src/libdraw/mkwsysrules.sh
@@ -24,6 +24,7 @@ echo 'WSYSTYPE='$WSYSTYPE
 echo 'X11='$X11
 
 if [ WSYSTYPE = x11 ]; then
+	echo 'CFLAGS=$CFLAGS -I$X11/include'
 	echo 'HFILES=$HFILES $XHFILES'
 fi