Try relocating the Qt install

Also remove addons since they are already installed

.travis.yml

@@ -1,17 +1,12 @@
 sudo: false
 language: generic
 
-addons:
-  apt:
-    packages:
-    - libfontconfig1-dev
-    - libgl1-mesa-dev
-    - libxrender-dev
-
 env:
     - SW=$HOME/sw PATH=$SW/bin:$PATH CFLAGS=-I$SW/include LDFLAGS=-L$SW/lib LD_LIBRARY_PATH=$SW/qt/lib:$SW/lib PKG_CONFIG_PATH=$SW/lib/pkgconfig QMAKE=$SW/qt/bin/qmake QMAKESPEC=$SW/qt/mkspecs/linux-g++
 
 before_install:
     - curl https://download.calibre-ebook.com/travis/sw-linux.tar.xz | tar xJ -C $HOME
+    - echo '[Paths]\nPrefix = ..' > $SW/qt/bin/qt.conf
+    - cat $SW/qt/bin/qt.conf
     - python setup.py bootstrap --ephemeral
 script: python setup.py test