--- src/bin/iclass/direct.c.orig	Sat Dec 12 13:40:42 1992
+++ src/bin/iclass/direct.c	Mon Jan  3 15:24:22 2000
@@ -30,11 +30,17 @@
 #include <OS/string.h>
 #include <OS/types.h>
 #include <stddef.h>
+#if __FreeBSD_cc_version < 400002
 #include <osfcn.h>
+#endif
 #include <pwd.h>
 #include <string.h>
 #include <stdlib.h>
 #include <sys/stat.h>
+
+#if __FreeBSD_cc_version >= 400003
+#include <unistd.h>
+#endif
 
 #ifdef __DECCXX
 extern "C" {