From 5436273ec728c8369dab9c08f2739805f20510f7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jens=20Hilligs=C3=B8e?= <github@hilli.dk>
Date: Tue, 23 Jul 2019 15:44:33 +0200
Subject: [PATCH] Make build_docker.sh portable again (#308)

Last commit made the script break on macOS.

From `man sed` (On Linux):

```
       -E, -r, --regexp-extended

              use extended regular expressions in the script (for portability use POSIX -E).
```
---
 build-docker.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/build-docker.sh b/build-docker.sh
index 2210cb5..f968545 100755
--- a/build-docker.sh
+++ b/build-docker.sh
@@ -63,7 +63,7 @@ if [ "${CONTAINER_EXISTS}" != "" ] && [ "${CONTINUE}" != "1" ]; then
 fi
 
 # Modify original build-options to allow config file to be mounted in the docker container
-BUILD_OPTS="$(echo ${BUILD_OPTS:-} | sed -r 's@\-c\s?([^ ]+)@-c /config@')"
+BUILD_OPTS="$(echo ${BUILD_OPTS:-} | sed -E 's@\-c\s?([^ ]+)@-c /config@')"
 
 ${DOCKER} build -t pi-gen "${DIR}"
 if [ "${CONTAINER_EXISTS}" != "" ]; then