export ALL_PROXY=socks5://127.0.0.1:1080
brew update
brew upgrade boost
ll /usr/local/Cellar/boost
drwxr-xr-x 6 xuhaibin admin 204 4 27 2017 1.64.0_1
drwxr-xr-x 6 xuhaibin admin 204 4 19 10:30 1.67.0
brew cleanup boost
Removing: /usr/local/Cellar/boost/1.64.0_1... (12,628 files, 395.7MB)
==> This operation has freed approximately 395.7MB of disk space.