diff --git a/configure.in b/configure.in
index 3845f05..8635fd3 100644
--- a/configure.in
+++ b/configure.in
@@ -2076,7 +2076,7 @@ AC_CACHE_CHECK(for sigsetjmp as a macro or function, ac_cv_func_sigsetjmp,
 
 AC_CACHE_CHECK(for __builtin_setjmp, ac_cv_func___builtin_setjmp,
 [AC_TRY_LINK([@%:@include <setjmp.h>
-    jmp_buf jb; void t(v) int v; {__builtin_longjmp(jb, v);}],
+    jmp_buf jb; __attribute__ ((used)) void t(v) int v; {__builtin_longjmp(jb, v);}],
     [__builtin_setjmp(jb);],
     [ac_cv_func___builtin_setjmp=yes],
     [ac_cv_func___builtin_setjmp=no])