From 95388b07bb7199d3766b1882b0acd4031ca4f1c3 Mon Sep 17 00:00:00 2001
From: Michael Hobbs <michaelshanehobbs@gmail.com>
Date: Wed, 16 Sep 2015 15:21:09 -0700
Subject: [PATCH] support DOCKER_VERSION when installing via Makefile

---
 Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Makefile b/Makefile
index 0073ecf76..c145ae860 100644
--- a/Makefile
+++ b/Makefile
@@ -104,6 +104,9 @@ docker: aufs
 	usermod -aG docker dokku
 ifndef CI
 	curl -sSL https://get.docker.com/ | sh
+ifdef DOCKER_VERSION
+	apt-get install -qq -y docker-engine=${DOCKER_VERSION} || (apt-cache madison docker-engine ; exit 1)
+endif
 	sleep 2 # give docker a moment i guess
 endif