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"