From: Brian Candler <b.candler@...>
Date: 2009-10-14T17:13:05+09:00
Subject: Re: Can I unpack ruby like a gem?

Ray K. wrote:
> And using both versions under ubuntu is a lot
> of work.

There are ruby1.8 and ruby1.9 packages, so I'd have thought it would be 
OK, although the ruby1.9 package is likely stale.

One option is for you to install the default ruby(1.8) from apt, and 
then build 1.9 from source:

./configure --program-suffix=19

then you will get /usr/local/bin/ruby19, /usr/local/bin/irb19 etc which 
won't conflict.

What I tend to do is just install multiple versions of ruby from source, 
in which case you'll get exactly which versions of 1.8.x and 1.9.x that 
you want.

Admittedly, it can get messy if you want 1.8.6 and 1.8.7 side by side, 
because they share the same lib dir and gems. If you want them to be 
absolutely 100% independent, then do

./configure --prefix=/opt/ruby187p174

and then symlink /opt/ruby187/bin/ruby to wherever you want to invoke it 
from (say /usr/bin/ruby18). The advantage of this is that you can do

    rm -rf /opt/ruby187p174

to get rid of that installation of ruby entirely, and a symlink update 
will allow you to switch forward and backward between different versions 
instantly.

Regards,

Brian.
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