--- a/report.c
+++ b/report.c
@@ -33,7 +33,7 @@
 /*
  * report - arpwatch report generating routines
  */
-
+#include <time.h>
 #include <sys/param.h>
 #include <sys/types.h>				/* concession to AIX */
 #include <sys/socket.h>
