From: Brian Candler <b.candler@...>
Date: 2009-05-20T22:00:59+09:00
Subject: Re: Copying a Ruby installation

Murali Somanchy wrote:
> I want to be able to copy it to some other directory say /usr1/ruby and
> run (Let us also imagine that /usr/ruby has been deleted).

This may or may not work. Ruby remembers a lot of things about how it 
was built and where it was installed: see

$ ruby -rrbconfig -rpp -e 'pp Config::CONFIG'

Have a look in your rbconfig.rb, which may be somewhere like 
/usr/lib/ruby/1.8/i486-linux/rbconfig.rb

Many of the constants in this file are defined relative to where 
rbconfig.rb itself exists, so they will be OK, but others may not.

Tools like rake use 'bindir' + 'ruby_install_name' to locate the ruby 
interpreter itself (to reinvoke it)

It is almost certainly going to be safer to recompile ruby to install 
under /usr1/ruby, and then distribute that. Use:

    ./configure --prefix=/usr1/ruby
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