From 137d36cce59fadad4deace257d90fd64f6b0e059 Mon Sep 17 00:00:00 2001
From: Todd Fleming <todd.fleming@gtri.gatech.edu>
Date: Mon, 2 Jan 2017 22:09:05 -0500
Subject: [PATCH] true and false may already be defined

---
 grbl/nuts_bolts.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/grbl/nuts_bolts.h b/grbl/nuts_bolts.h
index c936f2b..4b81805 100644
--- a/grbl/nuts_bolts.h
+++ b/grbl/nuts_bolts.h
@@ -22,8 +22,10 @@
 #ifndef nuts_bolts_h
 #define nuts_bolts_h
 
+#ifndef false
 #define false 0
 #define true 1
+#endif
 
 #define SOME_LARGE_VALUE 1.0E+38