diff --git a/support/build b/support/build
index 9b2ad80..a1073ce 100755
--- a/support/build
+++ b/support/build
@@ -148,6 +148,8 @@ args=(
 )
 parse_args "$@"; set -- "${args[@]}"
 
+[ -n "$Config" ] && setx Config=abspath "$Config"
+
 build_check_env || die
 [ "$action" == none ] && exit 0