Installing LuaJIT and Luarocks on OS X

Thanks to Homebrew, installing Lua on OS X is easy. I wanted to install the LuaJIT version as that is the one that I'm likely to be using in the future. It was just a matter of:

    $ brew install luajit

I also wanted to install the Luarocks package manager. My first attempt failed.

Then I found the very helpful instructions at Mesca's Homebrew-Luarocks page. 

Sadly, it is no longer available via Homebrew. I need to find a new method to install Luarocks to use with Luajit