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-rw-r--r--signal/sigrelse.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/signal/sigrelse.c b/signal/sigrelse.c
index 44e1001a06..971d60ffdf 100644
--- a/signal/sigrelse.c
+++ b/signal/sigrelse.c
@@ -18,6 +18,8 @@
    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.  */
 
+#define __need_NULL
+#include <stddef.h>
 #include <signal.h>
 
 int