在使用Homebrew安装nginx时,会遇见如下错误:

ksnowlv@ksnowlvdeMacBook-Pro~/Movies/PHP$brew install nginx
Error: You must `brew link pcre' before nginx can be installed
ksnowlv@ksnowlvdeMacBook-Pro~/Movies/PHP$

可使用命令brew link --overwrite pcre，强制链接并覆盖冲突的文件即可。

ksnowlv@ksnowlvdeMacBook-Pro~/Movies/PHP$brew link --overwrite pcre
Linking /usr/local/Cellar/pcre/8.35... 133 symlinks created
ksnowlv@ksnowlvdeMacBook-Pro~/Movies/PHP$brew install nginx

如果使用上述命令出错，则找到/usr/local/Cellar/pcre和/usr/local/opt/pcre的pcre目录干掉，重新安装pcre,再强制链接。