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-rw-r--r--signal/signal.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/signal/signal.h b/signal/signal.h
index b42d897f8b..aa51593b67 100644
--- a/signal/signal.h
+++ b/signal/signal.h
@@ -328,6 +328,8 @@ extern int sigstack __P ((__const struct sigstack *__ss,
 
 /* Alternate signal handler stack interface.
    This interface should always be preferred over `sigstack'.  */
+extern int __sigaltstack __P ((__const struct sigaltstack *__ss,
+			       struct sigaltstack *__oss));
 extern int sigaltstack __P ((__const struct sigaltstack *__ss,
 			     struct sigaltstack *__oss));