Actually use Qt5 for qt5-osx build

.travis.yml

@@ -8,6 +8,6 @@ os:
 compiler:
   - gcc
   - clang
-script: mkdir build && cd build && cmake .. -DWITH_QT4=$QT4 -DWITH_SERVER=1 && make
+script: ./travis-compile.sh
 install: ./travis-dependencies.sh
 cache: apt

travis-compile.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+set -e
+
+mkdir build
+cd build
+prefix=""
+if [[ $TRAVIS_OS_NAME == "osx" && $QT4 == 0 ]]; then
+  prefix="-DCMAKE_PREFIX_PATH=/usr/local/Cellar/qt5/5.3.0/"
+fi
+cmake .. -DWITH_SERVER=1 -DWITH_QT4=$QT4 $prefix
+make