--- ray/src/hd/rhoptimize.c	2010/09/30 15:43:30	3.20
+++ ray/src/hd/rhoptimize.c	2016/03/07 01:15:01	3.21
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char	RCSid[] = "$Id: rhoptimize.c,v 3.20 2010/09/30 15:43:30 greg Exp $";
+static const char	RCSid[] = "$Id: rhoptimize.c,v 3.21 2016/03/07 01:15:01 schorsch Exp $";
 #endif
 /*
  * Optimize holodeck for quick access.
@@ -125,9 +125,15 @@ rhinitcopy(	/* open files and copy header */
 		error(SYSTEM, errmsg);
 	}
 					/* set up signal handling */
+#ifdef SIGINT
 	if (signal(SIGINT, quit) == SIG_IGN) signal(SIGINT, SIG_IGN);
+#endif
+#ifdef SIGHUP
 	if (signal(SIGHUP, quit) == SIG_IGN) signal(SIGHUP, SIG_IGN);
+#endif
+#ifdef SIGTERM
 	if (signal(SIGTERM, quit) == SIG_IGN) signal(SIGTERM, SIG_IGN);
+#endif
 #ifdef SIGXCPU
 	if (signal(SIGXCPU, quit) == SIG_IGN) signal(SIGXCPU, SIG_IGN);
 	if (signal(SIGXFSZ, quit) == SIG_IGN) signal(SIGXFSZ, SIG_IGN);