From 9b05bceb202d46166e8964813e0eb4dffc19d2a7 Mon Sep 17 00:00:00 2001
From: Douglas Thain <dthain@nd.edu>
Date: Wed, 20 Sep 2017 15:49:09 -0400
Subject: [PATCH] ifdef header protection.

---
 QMC5883L.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/QMC5883L.h b/QMC5883L.h
index a4b0af1..fc31e86 100644
--- a/QMC5883L.h
+++ b/QMC5883L.h
@@ -1,3 +1,5 @@
+#ifndef QMC5883L_H
+#define QMC5883L_H
 
 class QMC5883L {
 public:
@@ -24,3 +26,5 @@ class QMC5883L {
   uint8_t range;
   uint8_t oversampling;
 };
+
+#endif