diff -ru readline-6.0.orig/signals.c readline-6.0/signals.c
--- readline-6.0.orig/signals.c	2009-01-23 15:57:00.000000000 +0000
+++ readline-6.0/signals.c	2009-04-20 11:58:16.815124484 +0000
@@ -592,8 +592,12 @@
   switch (sig)
     {
     case SIGINT:  c = _rl_intr_char; break;
+#if defined (SIGQUIT)
     case SIGQUIT: c = _rl_quit_char; break;
+#endif
+#if defined (SIGTSTP)
     case SIGTSTP: c = _rl_susp_char; break;
+#endif
     default: return;
     }