attempt to fix build on platform.sh

Author: robfrawley

.platform.app.yaml

@@ -43,13 +43,8 @@ web:
 # The size of the persistent disk of the application (in MB).
 disk: 512
 
-# Build time dependencies.
-dependencies:
-  python:
-    sphinx: "1.3.6"
-
 # The hooks that will be performed when the package is deployed.
 hooks:
     build: |
-      pip install git+https://github.com/fabpot/sphinx-php.git
-      make -C _build html
+      pip install --ignore-installed --user git+https://github.com/fabpot/sphinx-php.git
+      SPHINXBUILD=~/.local/bin/sphinx-build make -e -C _build html