--- xevil-2.02r2.orig/x11/gen_xpm/world/block_18.xpm
+++ xevil-2.02r2/x11/gen_xpm/world/block_18.xpm
@@ -1,5 +1,5 @@
 /* XPM */
-static char *block_18[] = {
+static const char *block_18[] = {
   /* width height ncolors chars_per_pixel */
   "32 32 16 1 0 0",
   /* colors */