Fail to use brew on Travis

.travis.yml

@@ -18,20 +18,21 @@ matrix:
             - liblapack-dev
             - pyqt4-dev-tools
             - python-qt4
-    - os: osx
-      osx_image: xcode8
-      language: generic
-      env:
-        - PYTHON_VERSION=2.7.10
-        - PYENV_ROOT=~/.pyenv
-        - PATH=$PYENV_ROOT/shims:$PATH:$PYENV_ROOT/bin
-    - os: osx
-      osx_image: xcode9
-      language: generic
-      env:
-        - PYTHON_VERSION=2.7.10
-        - PYENV_ROOT=~/.pyenv
-        - PATH=$PYENV_ROOT/shims:$PATH:$PYENV_ROOT/bin
+    # FIXME: brew cannot be run on Travis.
+    # - os: osx
+    #   osx_image: xcode8
+    #   language: generic
+    #   env:
+    #     - PYTHON_VERSION=2.7.10
+    #     - PYENV_ROOT=~/.pyenv
+    #     - PATH=$PYENV_ROOT/shims:$PATH:$PYENV_ROOT/bin
+    # - os: osx
+    #   osx_image: xcode9
+    #   language: generic
+    #   env:
+    #     - PYTHON_VERSION=2.7.10
+    #     - PYENV_ROOT=~/.pyenv
+    #     - PATH=$PYENV_ROOT/shims:$PATH:$PYENV_ROOT/bin
     - os: linux
       dist: trusty
       language: python
@@ -46,7 +47,7 @@ matrix:
         - USE_CONDA=true
 
 before_install:
-  - if [ "$TRAVIS_OS_NAME" = "linux" -a "$USE_CONDA" = "true" ]; then
+  - if [ "$USE_CONDA" = "true" ]; then
       if [ "$TRAVIS_PYTHON_VERSION" = "2.7" ]; then
         wget https://repo.continuum.io/miniconda/Miniconda2-latest-Linux-x86_64.sh -O miniconda.sh;
       else