下载最新版openssl
https://www.openssl.org/source/
安装
./Configure darwin64-x86_64-cc
make
make test
sudo make install
whichlydeMacBook-Air:~ wanyu$ which openssl
/usr/local/bin/openssl
lydeMacBook-Air:~ wanyu$ /usr/local/bin/openssl version
OpenSSL 1.1.0e 16 Feb 2017
其实只需要下载解压，找到 include/openssl 目录，copy到
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include
原文地址：http://ios931.blog.51cto.com/8002272/1904822
