From 4be228653df9028bef4a288148d392d7e9b0448a Mon Sep 17 00:00:00 2001
From: Joffrey F <joffrey@docker.com>
Date: Mon, 20 Jul 2015 14:06:33 -0700
Subject: Make build auth work with API versions < 1.19 too

---
 docker/client.py | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/docker/client.py b/docker/client.py
index 7fe72db..41dd03a 100644
--- a/docker/client.py
+++ b/docker/client.py
@@ -140,9 +140,14 @@ class Client(clientbase.ClientBase):
             if self._auth_configs:
                 if headers is None:
                     headers = {}
-                headers['X-Registry-Config'] = auth.encode_header(
-                    self._auth_configs
-                )
+                if utils.compare_version('1.19', self._version) >= 0:
+                    headers['X-Registry-Config'] = auth.encode_header(
+                        self._auth_configs
+                    )
+                else:
+                    headers['X-Registry-Config'] = auth.encode_header({
+                        'configs': self._auth_configs
+                    })
 
         response = self._post(
             u,
-- 
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