From fb96a4650e82f79eb0afb26e45c0ff77f1013228 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pjm@nac.net>
Date: Mon, 08 Oct 2012 22:22:52 -0400
Subject: Improve non-option argument handling in configure.

---
diff --git a/configure b/configure
index b9ddeb9..4e8d03a 100755
--- a/configure
+++ b/configure
@@ -71,6 +71,11 @@ ${features}"
 main()
 {
 	parse_options "${@}"
+	shift ${optind}
+	if [ ${#} -ne 0 ]; then
+		print_usage
+		exit
+	fi
 
 	for dep in ${dep_cmds}; do
 		dep_name="$(printf '%s' "${dep}" | tr -c '[a-z0-9]' '_')"
@@ -181,6 +186,8 @@ EOF
 
 parse_options()
 {
+	optind=0
+
 	for _opt; do
 
 		# Handle arguments of "--opt arg" options.
@@ -234,8 +241,7 @@ parse_options()
 				_type='option'
 				;;
 			*)
-				printf 'unrecognized option: %s\n' "${_opt}" >&2
-				exit 1
+				break
 				;;
 		esac
 
@@ -253,6 +259,8 @@ EOF
 			_prev="${_opt}"
 		fi
 
+		optind=$(($optind + 1))
+
 	done
 }
 
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