diff --git a/Makefile b/Makefile
index 194895f..f7f8112 100644
--- a/Makefile
+++ b/Makefile
@@ -3,3 +3,7 @@
 all:
 	./util/mirror-tarballs
 
+test:
+	cp util/configure ngx_openresty-0.8.54.0/
+	cd ngx_openresty-0.8.54.0 && ./configure
+
diff --git a/util/configure b/util/configure
old mode 100644
new mode 100755
index 99a4f16..b0f34ec
--- a/util/configure
+++ b/util/configure
@@ -1,5 +1,6 @@
 #!/usr/bin/env perl
 
+use 5.004;
 use strict;
 use warnings;