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-rw-r--r--signal/sigisempty.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/signal/sigisempty.c b/signal/sigisempty.c
index 50dc343491..24e166d00e 100644
--- a/signal/sigisempty.c
+++ b/signal/sigisempty.c
@@ -18,6 +18,8 @@
#include <errno.h>
#include <signal.h>
+#define __need_NULL
+#include <stddef.h>
/* Test whether SET is empty. */
int