MAC下安装pycurl报错SSL的解决方法

错误信息是Curl is configured to use SSL, but we have not been able to determine which SSL backend it is using. Please see PycURL documentation for how to specify the SSL backend manually，其实就是让我们在安装之前配置openssl的环境变量

但是这里有一个坑：在高版本的mac系统环境变量里是找不到openssl的头文件的
因为新版本Mac的openssl版本 LibreSSL 2.2.7

pip3 uninstall pycurl# 卸载库
export PYCURL_SSL_LIBRARY=openssl
export LDFLAGS=-L/usr/local/opt/openssl/lib
export CPPFLAGS=-I/usr/local/opt/openssl/include# openssl相关头文件路径
pip3 install pycurl --compile --no-cache-dir # 重新编译安装

至此终于搞定。