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-rw-r--r--signal/sigandset.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/signal/sigandset.c b/signal/sigandset.c
index bb3747c19d..962cf015d4 100644
--- a/signal/sigandset.c
+++ b/signal/sigandset.c
@@ -18,6 +18,8 @@
 
 #include <errno.h>
 #include <signal.h>
+#define __need_NULL
+#include <stddef.h>
 
 /* Combine sets LEFT and RIGHT by logical AND and place result in DEST.  */
 int