From 254fb0c490c62c0e29518cab2d8b5c90a30b378c Mon Sep 17 00:00:00 2001
From: Lars-Dominik Braun <lars@6xq.net>
Date: Tue, 9 Dec 2014 12:42:20 +0100
Subject: accel: Fix shake gesture detection

---
 common.h | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'common.h')

diff --git a/common.h b/common.h
index eced70e..e879e92 100644
--- a/common.h
+++ b/common.h
@@ -44,5 +44,7 @@ enum {
 
 void shutdownError ();
 
+#define sign(x) ((x < 0) ? -1 : 1)
+
 #endif /* COMMON_H */
 
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