--- bitmaps/left.xbm.orig	1994-12-17 21:29:48 UTC
+++ bitmaps/left.xbm
@@ -1,7 +1,7 @@
 /* Copyright (c) 1993 by Sanjay Ghemawat */
 #define left_width 16
 #define left_height 16
-static char left_bits[] = {
+static unsigned char left_bits[] = {
    0x00, 0x00, 0x80, 0x01, 0x40, 0x01, 0x20, 0x01, 0x10, 0x01, 0x08, 0x7f,
    0x04, 0x40, 0x02, 0x40, 0x02, 0x40, 0x04, 0x40, 0x08, 0x7f, 0x10, 0x01,
    0x20, 0x01, 0x40, 0x01, 0x80, 0x01, 0x00, 0x00};