use X11 in /usr if it is there

src/cmd/devdraw/mkwsysrules.sh

diff --git a/src/cmd/devdraw/mkwsysrules.sh b/src/cmd/devdraw/mkwsysrules.sh
index 6b70f43..84fad02 100644
--- a/src/cmd/devdraw/mkwsysrules.sh
+++ b/src/cmd/devdraw/mkwsysrules.sh
@@ -11,6 +11,10 @@
 		X11=/usr/X
 	elif [ -d /usr/openwin ]; then	# for Sun
 		X11=/usr/openwin
+	elif [ -d /usr/include/X11 ]; then
+		X11=/usr
+	elif [ -d /usr/local/include/X11 ]; then
+		X11=/usr/local
 	else
 		X11=noX11dir
 	fi