mac安装xlearn遇到的cmake、gcc问题

直接用pip install xlearn 网络老是失败。

然后就下载好xlearn-0.40a1.tar.gz 包，通过pip install ./xlearn-0.40a1.tar.gz安装。

但是报错

Failed building wheel for xlearn
……
Exception: Please install CMake first
……

但是看cmake已经安装了。

(base) xin:Downloads xin$ pip install CMake
Requirement already satisfied: CMake in /Users/xin/anaconda3/lib/python3.7/site-packages (3.17.2)

(base) xin:Downloads xin$ brew install CMake
Warning: cmake 3.17.1 is already installed and up-to-date
To reinstall 3.17.1, run `brew reinstall cmake`

然后谷歌搜索Exception: Please install CMake first，看到一篇安装xlearn的文章。提到需要安装gcc、cmake。
https://linxid.github.io/2018/05/10/Xlearn/

然后就检查一下gcc是否安装。

(base) xin:Downloads xin$ gcc --version
xcrun: error: invalid active developer path