--- a/brewpanel/brewpanel.h	Thu Nov 19 15:05:19 2015 +0100
+++ b/brewpanel/brewpanel.h	Thu Nov 19 20:45:09 2015 +0100
@@ -26,6 +26,8 @@
 #include <signal.h>
 #include <getopt.h>
 #include <limits.h>
+#include <math.h>
+
 
 #ifdef HAVE_SDL_SDL_H
 #include <SDL.h>