This patch, put together by Manuel Novoa III, is a merge of work
done by Evin Robertson (bug#1105) and work from Manuel to make
usage messages occupy less space and simplify how usage messages
are displayed.
diff --git a/rmdir.c b/rmdir.c
index 86346dd..6266ce1 100644
--- a/rmdir.c
+++ b/rmdir.c
@@ -33,7 +33,7 @@
 	int status = EXIT_SUCCESS;
 
 	if (argc == 1 || **(argv + 1) == '-')
-		usage(rmdir_usage);
+		show_usage();
 
 	while (--argc > 0) {
 		if (rmdir(*(++argv)) == -1) {