On: Installing Rails on a Mac Shouldn't Be As Hard As ...

[pyre]

The php interpreter isn't used by system processes. I'm not sure how essential the stock Ruby interpreter, but I know that on Linux the system Perl & Python interpreters are used by system processes and upgrading them could potentially break things.

[jasomill → pyre]

OS X Server uses both PHP and Ruby. From my Lion Server:

    jtm@vertex ~ $ find /usr/share -iname *.php | wc -l
         165
    jtm@vertex ~ $ find /usr/share -iname *.rb | wc -l
        5855

Even if you don't use OS X Server, Ruby.framework has been part of the API since Leopard [1], so applications can (and do) depend on it.

[1] https://developer.apple.com/library/mac/#documentation/MacOS...