Fix:

error: format not a string literal and no format arguments [-Werror=format-security]

https://sourceforge.net/p/aewan/bugs/13/
--- aewan.c
+++ aewan.c
@@ -139,7 +139,7 @@
       static char *msg = "[Document contains no layers; press F1 for menu]";
       kurses_move((scr_width - strlen(msg)) / 2, scr_height / 2);
       kurses_color(7, 0);
-      printw(msg);
+      printw("%s", msg);
       refresh();
       return;
    }