A little bit of bikeshedding again

I love to repaint it every day.

.travis.yml

@@ -2,8 +2,7 @@ language: python
 python: "2.7"
 env:
     global:
-        - IS_TRAVIS=true  # used by owncloud-testserver to install php
-        - CFLAGS=-O0  # speed up lxml build
+        - IS_TRAVIS=true
     matrix:
         - DAV_SERVER=radicale_filesystem REQUIREMENTS=release
         - DAV_SERVER=radicale_filesystem REQUIREMENTS=devel

install-deps.sh

@@ -4,12 +4,13 @@ set -e
 [ -n "$DAV_SERVER" ] || DAV_SERVER=radicale_filesystem
 [ -n "$REQUIREMENTS" ] || REQUIREMENTS=release
 
+PIP_INSTALL="pip install"
 if [ "$IS_TRAVIS" = "true" ]; then
+    export CFLAGS=-O0  # speed up builds of packages which don't have wheels
     PIP_INSTALL="pip install --use-wheel --find-links=http://dev.unterwaditzer.net/vdirsyncer/wheels/"
     pip install --upgrade wheel pip setuptools
-else
-    PIP_INSTALL="pip install"
 fi
+
 $PIP_INSTALL --editable .
 $PIP_INSTALL -r requirements.txt