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brew tap ethereum/ethereum
brew install solidity
报了个错误
Error: An unexpected error occurred during the `brew link` step
The formula built, but is not symlinked into /usr/local
Permission denied @ dir_s_mkdir - /usr/local/Frameworks
Error: Permission denied @ dir_s_mkdir - /usr/local/Frameworks
lixiangdeMacBook-Pro:dockerDir lixiang$ sudo brew install solidity
很明显，没有创建目录的权限，而且无法使用root创建执行brew，
于是我用 sudo 创建了目录/usr/local/Frameworks
再次运行可以了。