1. 安装PCRE Download latest PCRE. After download go to download directory from terminal. $ cd ~/Download $ tar xvzf pcre-8.34.tar.gz $ cd pcre-8.34 $ sudo ./configure --prefix=/usr/local $ sudo make $ sudo install 此步骤遇到的问题:因为mac上安装了不同版本的xcode导致不能安装,找不到