--- periodic.h.orig	Sat Aug 14 22:55:52 2010
+++ periodic.h	Sat Aug 14 22:56:09 2010
@@ -296,7 +296,7 @@ modification follow.
 #ifdef VMS
 #include <curses.h>
 #endif
-#if defined(linux) || defined(__FreeBSD)
+#if defined(linux) || defined(__FreeBSD) || defined(__OpenBSD__)
 #include <ncurses.h>
 #endif