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-rw-r--r--support/xsignal.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/support/xsignal.h b/support/xsignal.h
index 973f532..d868bb3 100644
--- a/support/xsignal.h
+++ b/support/xsignal.h
@@ -28,7 +28,9 @@ __BEGIN_DECLS
terminate the process on error. */
void xraise (int sig);
+#ifdef _GNU_SOURCE
sighandler_t xsignal (int sig, sighandler_t handler);
+#endif
void xsigaction (int sig, const struct sigaction *newact,
struct sigaction *oldact);