message: try to enable caching in travis (3)
diff: @@ -45,7 +45,7 @@ env:
  - Atlas_ROOT_DIR=/usr/include/ # for cmake to find lapacke.h
  before_script:
  - - mkdir ~/build/opencv
  + - mkdir ~/build/opencv ; true
  - wget -O- https://github.com/opencv/opencv/archive/$OPENCV_VERSION.tar.gz | tar -xzC ~/build/opencv
  - wget -O- https://github.com/opencv/opencv_contrib/archive/$OPENCV_VERSION.tar.gz | tar -xzC ~/build/opencv
  - mkdir -p ~/build/opencv/opencv-$OPENCV_VERSION-build
  