--- plasma-desktop-5.6.3/kcms/touchpad/src/backends/x11/synapticstouchpad.cpp.orig	2016-05-08 20:29:56.538450634 +0200
+++ plasma-desktop-5.6.3/kcms/touchpad/src/backends/x11/synapticstouchpad.cpp	2016-05-08 20:28:30.652542299 +0200
@@ -53,6 +53,7 @@
 #include <stddef.h>
 #include <limits.h>
 #include <xorg/synaptics-properties.h>
+#include <cmath>
 
 #define SYN_MAX_BUTTONS 12