$NetBSD: patch-cb,v 1.4 2011/08/02 16:15:08 taca Exp $

* Before calling sigsend(), make sure the function actuall exists.
  Fixes the build on NetBSD >= 4.99.49, in which the macro P_MYID
  is defined somewhere unrelated to signals.

--- libmysqld/stacktrace.c.orig	2010-01-15 09:49:23.000000000 +0000
+++ libmysqld/stacktrace.c
@@ -271,7 +271,7 @@ void write_core(int sig)
   __gcov_flush();
 #endif
   pthread_kill(pthread_self(), sig);
-#if defined(P_MYID) && !defined(SCO)
+#if HAVE_SIGSEND && defined(P_MYID) && !defined(SCO)
   /* On Solaris, the above kill is not enough */
   sigsend(P_PID,P_MYID,sig);
 #endif