--- lib/Texture.cc.orig	Tue Apr 25 16:41:03 2017
+++ lib/Texture.cc	Tue Apr 25 16:41:25 2017
@@ -31,6 +31,7 @@
 
 #include <X11/Xlib.h>
 #include <ctype.h>
+#include <stdlib.h>
 
 
 void bt::Texture::setColor1(const bt::Color &new_color) {