From: "P. J. McDermott" <pjm@nac.net>
Description: Better handle unecognized options
 optind needs to be incremented for every option.

diff -Naur src.orig/configure src/configure
--- src.orig/configure	2013-06-01 11:50:34.000000000 -0400
+++ src/configure	2013-06-03 13:13:51.812554003 -0400
@@ -266,9 +266,7 @@
 		if [ ${?} -ne 0 ]; then
 			printf 'warning: unrecognized %s name: %s\n' \
 				"${_type}" "${_opt}" >&2
-			continue
-		fi
-		if ${_optarg_set}; then
+		elif ${_optarg_set}; then
 			_opt="$(printf '%s' "${_opt}" | tr -c '[a-z0-9]' '_')"
 			eval "${_opt}"=\"\$\{_optarg\}\"
 		else