python lightgbm安装 --Mac版

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在网上看着教程安装，结果出现问题。
先贴网上找到的教程：

#先安装cmake和gcc，安装过的直接跳过前两步
brew install cmake
brew install gcc
#克隆LightGBM项目
git clone --recursive https://github.com/Microsoft/LightGBM ; cd LightGBM
#编译安装
mkdir build ; cd build
cmake ..
make -j4
cd ../python-package
sudo python setup.py install

结果在cmake ..时报错：

CMake Error at CMakeLists.txt:24 (message):
  AppleClang wasn't supported.  Please see
  https://github.com/Microsoft/LightGBM/blob/master/docs/Installation-Guide.rst#macos


-- Configuring incomplete, errors occurred!

幸好LightGBM在报错信息里给出了官方安装教程：
https://github.com/Microsoft/LightGBM/blob/master/docs/Installation-Guide.rst#macos
发现官方教程在cmake之前有一步添加环境变量：export CXX=g++-7 CC=gcc-7

附完整安装步骤：

brew install cmake
brew install gcc
git clone --recursive https://github.com/Microsoft/LightGBM ; cd LightGBM
export CXX=g++-7 CC=gcc-7
mkdir build ; cd build
cmake ..
make -j4
cd ../python-package
python setup.py install