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-rw-r--r--signal/sigaddset.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/signal/sigaddset.c b/signal/sigaddset.c
index 7238df4738..cfb3373b13 100644
--- a/signal/sigaddset.c
+++ b/signal/sigaddset.c
@@ -17,6 +17,7 @@
 
 #include <errno.h>
 #include <signal.h>
+#include <sigsetops.h>
 #include <internal-signals.h>
 
 /* Add SIGNO to SET.  */