--- a/common/rcslib.h
+++ b/common/rcslib.h
@@ -30,6 +30,8 @@
 #ifndef __RCSLIB_H__
 #define	__RCSLIB_H__

+#include <inttypes.h> /* int32_t */
+
 /*
  * rcsfile(5) - Manual Page Revision: 1.5.2.1; Release Date: 2001/07/22
  */