diff -ur lwp-2.6~/src/lwp_ucontext.c lwp-2.6/src/lwp_ucontext.c

--- lwp-2.6~/src/lwp_ucontext.c	2010-03-17 16:32:51.000000000 -0400

+++ lwp-2.6/src/lwp_ucontext.c	2010-04-01 11:38:55.495718223 -0400

@@ -21,9 +21,6 @@

 #include <string.h>

 #include <unistd.h>

-/* avoid breaking longjmp stack switching */

-#undef _FORTIFY_SOURCE

-#define _FORTIFY_SOURCE 0

 #include "lwp_ucontext.h"

 /* Some architectures have a stack that grows up instead of down */

diff -ur lwp-2.6~/src/lwp_ucontext.h lwp-2.6/src/lwp_ucontext.h

--- lwp-2.6~/src/lwp_ucontext.h	2008-12-09 15:13:12.000000000 -0500

+++ lwp-2.6/src/lwp_ucontext.h	2010-04-01 11:38:36.160841037 -0400

@@ -21,7 +21,17 @@

 #include <config.h>

 #endif

+/* work around longjmp_chk */

+#ifdef __USE_FORTIFY_LEVEL

+#define LWP_SAVE_USE_FORTIFY_LEVEL __USE_FORTIFY_LEVEL

+#undef __USE_FORTIFY_LEVEL

 #include <setjmp.h>

+#define __USE_FORTIFY_LEVEL LWP_SAVE_USE_FORTIFY_LEVEL

+#undef LWP_SAVE_USE_FORTIFY_LEVEL

+#else

+#include <setjmp.h>

+#endif

+

 #include <signal.h>

 #include "lwp_stacktrace.h"