diff --git a/devel/autoconf/files/cdiff b/devel/autoconf/files/cdiff
new file mode 100755
index 00000000000..0888e360faa
--- /dev/null
+++ b/devel/autoconf/files/cdiff
@@ -0,0 +1,22 @@
+#!/bin/sh
+
+# $OpenBSD: cdiff,v 1.1 2001/09/16 20:37:05 espie Exp $
+
+# Public domain
+# Written 2001, Marc Espie
+
+# This small script can be used to check two configure script,
+# to verify that our home-made autoconf is working properly, for instance.
+
+a=`mktemp /tmp/$1.XXXXXXXXXX`
+b=`mktemp /tmp/$2.XXXXXXXXXX`
+trap 'rm $a $b; exit 0' 0 1 2 3 13 15
+sed -e 's,configure:[0-9]*:,configure:####:,' 	\
+	-e 's,^#line [0-9]*,#line ####,'	\
+	<$1 >$a
+sed -e 's,configure:[0-9]*:,configure:####:,' 	\
+	-e 's,^#line [0-9]*,#line ####,'	\
+	<$2 >$b
+diff -u $a $b|sed -e s,$a,$1, -e s,$b,$2,
+
+rm -f $a $b