目前通过源代码编译安装MacPorts，是唯一的在mac os x10.12 sierra上安装的方式
下载MacPorts源代码
cd ~
mkdir ./mports
cd ./mports
sudo svn checkout https://svn.macports.org/repository/macports/trunk/base
安装MacPorts
cd base
sudo ./configure --enable-readline
sudo make
sudo make install
更新mac环境变量
cd ~
vi ./.bash_profile
export PATH=$PATH:/opt/local/bin
检查是否安装成功
which port
更新ports资源树
sudo port -v selfupdate
Agree To License
sudo xcodebuild -license
