Fixes for running on older Docker versions

Makefile

@@ -16,7 +16,7 @@ BUILD_SERVER_CONTAINER=build-server
 DOCKER_TAG_ARCH ?= $(shell uname -m)
 # By default, all Docker client commands are run inside a Docker container.
 # This means that newer features of the client can be used, even with an older daemon.
-DOCKER ?= docker run --interactive --rm --volume /var/run/docker.sock:/var/run/docker.sock --volume "$(CURDIR)":/var/src --workdir /var/src docker:stable docker
+DOCKER ?= docker
 DOCKER_TAG ?= latest-$(DOCKER_TAG_ARCH)
 DOCKER_REPO_DEVSERVER ?= mq-devserver
 DOCKER_REPO_ADVANCEDSERVER ?= mq-advancedserver
@@ -150,9 +150,10 @@ define docker-build-mq
 	  --volume "$(realpath ./downloads/)":/usr/share/nginx/html:ro \
 	  --detach \
 	  nginx:alpine
+	# Make sure we have the latest base image
+	$(DOCKER) pull ubuntu:16.04
 	# Build the new image
 	$(DOCKER) build \
-	  --pull \
 	  --tag $1 \
 	  --file $2 \
 	  --network build \

docs/developing.md

@@ -2,8 +2,8 @@
 
 ## Prerequisites
 You need to ensure you have the following tools installed:
-* [Docker](https://www.docker.com/)
-* GNU make
+* [Docker](https://www.docker.com/) V17.05 or later
+* [GNU make](https://www.gnu.org/software/make/)
 
 You might also need the following tools installed: 
 * [Go](https://golang.org/) - only needed for running the tests