Index: mod-mono-2.4.2/src/mod_mono.c
===================================================================
--- mod-mono-2.4.2.orig/src/mod_mono.c	2009-12-15 23:26:41.000000000 +0000
+++ mod-mono-2.4.2/src/mod_mono.c	2009-12-15 23:27:07.000000000 +0000
@@ -1772,7 +1772,10 @@
 
 	/* Unblock signals Mono uses: see bug #472732 */
 	sigemptyset (&sigset);
+#ifdef SIGPWR
+	/* SIGPWR signal does not exist on GNU/kFreeBSD */
 	sigaddset (&sigset, SIGPWR);
+#endif
 	sigaddset (&sigset, SIGXCPU);
 	sigaddset (&sigset, 33);
 	sigaddset (&sigset, 35);