--- xlbacking.C.orig	Tue Feb 28 15:05:47 2017
+++ xlbacking.C	Tue Feb 28 15:05:52 2017
@@ -102,7 +102,7 @@ void win_backing::background(int i)
     XSetBackground(disp,gc,bgcolor);
 }
 
-void win_backing::font(char *s)
+void win_backing::font(const char *s)
 {
     Font f1 = XLoadFont(disp,s);
     XSetFont(disp,gc,f1);
