message: FIX: TravisCI for macos was failing due to homebrew auto update
  mechanism
diff: @@ -81,7 +81,7 @@ before_install:
  - if test "$CUDA" != NONE; then travis_retry sudo apt-get clean; fi
  - if test "$CUDA" != NONE; then export CUDA_TOOLKIT_ROOT_DIR=/usr/local/cuda-${CUDA%%-*}; fi
  - if test "$CUDA" != NONE; then export PATH=${CUDA_TOOLKIT_ROOT_DIR}/bin:${PATH}; fi
  - - if test $TRAVIS_OS_NAME == osx ; then brew update; brew install fftw; fi
  + - if test $TRAVIS_OS_NAME == osx ; then HOMEBREW_NO_AUTO_UPDATE=1 brew install fftw; fi
  - export PATH=$(echo $PATH | tr ':' "\n" | sed '/\/opt\/python/d' | tr "\n" ":" | sed "s|::|:|g")
  before_script:
  