try to get qt4 install working on macOS

Author: skvark

.travis.yml

@@ -29,43 +29,51 @@ matrix:
 
     # default builds for MacOS
     - os: osx
+      language: generic
       osx_image: xcode7.3
       env:
         - MB_PYTHON_VERSION=2.7
         - ENABLE_CONTRIB=0
     - os: osx
+      language: generic
       osx_image: xcode7.3
       env:
         - MB_PYTHON_VERSION=3.4
         - ENABLE_CONTRIB=0
     - os: osx
+      language: generic
       osx_image: xcode7.3
       env:
         - MB_PYTHON_VERSION=3.5
         - ENABLE_CONTRIB=0
     - os: osx
+      language: generic
       osx_image: xcode7.3
       env:
         - MB_PYTHON_VERSION=3.6
         - ENABLE_CONTRIB=0
 
     # Contrib builds for MacOS
     - os: osx
+      language: generic
       osx_image: xcode7.3
       env:
         - MB_PYTHON_VERSION=2.7
         - ENABLE_CONTRIB=1
     - os: osx
+      language: generic
       osx_image: xcode7.3
       env:
         - MB_PYTHON_VERSION=3.4
         - ENABLE_CONTRIB=1
     - os: osx
+      language: generic
       osx_image: xcode7.3
       env:
         - MB_PYTHON_VERSION=3.5
         - ENABLE_CONTRIB=1
     - os: osx
+      language: generic
       osx_image: xcode7.3
       env:
         - MB_PYTHON_VERSION=3.6

config.sh

@@ -24,6 +24,7 @@ function pre_build {
     echo "Running for OSX"
 
     echo 'Installing QT4'
+    brew update
     brew tap cartr/qt4
     brew tap-pin cartr/qt4
     brew install qt@4