Install nginx:
$ brew install nginx
Use custom launchctl
plist (see homebrew.mxcl.nginx.plist below):
$ sudo vim /Library/LaunchDaemons/homebrew.mxcl.nginx.plist
$ sudo launchctl load -w /Library/LaunchDaemons/homebrew.mxcl.nginx.plist
Tell pow to leave port 80 alone:
$ echo "export POW_DST_PORT=88" >> ~/.powconfig
Install Pow:
$ curl get.pow.cx | sh