1 files changed, 1 insertions, 0 deletions
diff --git a/configure b/configure
index c5743d1..67bc927 100755
--- a/configure
+++ b/configure
@@ -202,6 +202,7 @@ EOF
 			exit 1
 		fi
 		if ${_optarg_set}; then
+			_opt="$(printf '%s' "${_opt}" | tr -c '[a-z0-9]' '_')"
 			eval ${_opt}=\$\{_optarg\}
 		else
 			_prev="${_opt}"