--- a/lib/libutil/pidfile.c	2019-06-28 17:20:40.000000000 +0300
+++ b/lib/libutil/pidfile.c	2020-10-16 12:52:17.812742477 +0300
@@ -30,6 +30,7 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include <sys/cdefs.h>
 #include <sys/types.h>
 #include <errno.h>
 #include <paths.h>