--- a/brewpanel/slcd.h	Thu Nov 19 21:17:26 2015 +0100
+++ b/brewpanel/slcd.h	Thu Nov 19 22:50:17 2015 +0100
@@ -15,6 +15,7 @@
 void slcdPutchar     (int fd, unsigned char data) ;
 void slcdPuts        (int fd, const char *string) ;
 void slcdPrintf      (int fd, const char *message, ...) ;
+void slcdBacklight   (int fd, int bl);
 
 int  slcdInit        (int fd, int x, int y, int w, int h, int cols, int rows) ;