From b87563b7bd21b7b339529541f7f24063ca8f5075 Mon Sep 17 00:00:00 2001
From: Olivier Houchard <cognet@ci0.org>
Date: Thu, 15 Jun 2017 19:25:35 +0200
Subject: [PATCH] configure: Fix usage with busybox.

expr as provided by busybox doesn't know about --, while most other
implementations require it, or it'd try to interpret --prefix=whatever as
one of its own options. To fix this, we just remove the first two characters
of the option before calling expr, rendering -- useles.
---
 configure | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index 29a1f2c..9d2fe83 100755
--- a/configure
+++ b/configure
@@ -169,7 +169,8 @@ generate_stdout()
 for option; do
 	case "$option" in
 	*=?*)
-		value=`expr -- "$option" : '[^=]*=\(.*\)'`
+		optname=`echo $option|cut -c 3-`
+		value=`expr "$optname" : '[^=]*=\(.*\)'`
 		;;
 	*=)
 		value=
@@ -294,7 +295,8 @@ for option; do
 		fi
 		;;
 	*=*)
-		NAME=`expr -- "$option" : '\([^=]*\)='`
+		optname=`echo $option|cut -c 3-`
+		NAME=`expr "$optname" : '\([^=]*\)='`
 		eval "$NAME='$value'"
 		export $NAME
 		;;