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/which.c b/which.c
index 981a8ac..1908db3 100644
--- a/which.c
+++ b/which.c
@@ -33,7 +33,7 @@
 	int i, count=1, found, status = EXIT_SUCCESS;
 
 	if (argc <= 1 || **(argv + 1) == '-')
-		usage(which_usage);
+		show_usage();
 	argc--;
 
 	path_list = getenv("PATH");