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-rw-r--r--signal/sigsetops.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/signal/sigsetops.c b/signal/sigsetops.c
index 9a3a834d5b..0317662a14 100644
--- a/signal/sigsetops.c
+++ b/signal/sigsetops.c
@@ -1,6 +1,11 @@
 /* Define the real-function versions of all inline functions
    defined in signal.h (or bits/sigset.h).  */
 
+#include <features.h>
+
 #define _EXTERN_INLINE
+#ifndef __USE_EXTERN_INLINES
+# define __USE_EXTERN_INLINES	1
+#endif
 
 #include "signal.h"