--- wmmon.c.orig	Fri Jan  8 16:54:07 1999
+++ wmmon.c	Fri Jan  8 16:54:25 1999
@@ -220,11 +220,13 @@
 		}
 	}
 
+#if __FreeBSD_version >= 300000
 	if( checkversion() < 0 )
 	{
 		fprintf( stderr, devstat_errbuf );
 		exit(1);
 	}
+#endif
 
 	wmmon_routine(argc, argv);
 }