From: David Masover <ninja@...>
Date: 2009-12-08T16:57:45+09:00
Subject: Re: Install ruby 1.9.1

On Tuesday 08 December 2009 12:15:06 am Ruby Freak wrote:
> I spent an hour trying to find reasonable instructions on how to
> install ruby 1.9.1 as a standalone ruby instance.

sudo apt-get install ruby1.9.1

> Everything seems to
> be directed at side-by-side 1.8/1.9 installation.

Mostly because it's not really to where we can safely ignore either of them. 
But you could probably adapt this:

<http://groups.google.com/group/rails-
oceania/browse_thread/thread/8a2b256d117db49f>

Just ignore the parts about 1.8.

Or, better yet -- the only real reason you can't just 'apt-get install 
ruby1.9.1', or for that matter, 'apt-get install ruby1.9.1 rubygems1.9.1 
irb1.9.1 ruby1.9.1-dev ...'

...is because it installs the binary as /usr/bin/ruby1.9.1, which is going to 
be annoying and inconvenient.

But yeah, basically, anything that told you to install rubyfoo or libfoo-ruby 
or anything like that, chances are, there's an equivalent package for 1.9.1.

> Here is what I did:
> 
> 1: Download ruby 1.9.1,
>  ftp://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.1-p0.tar.gz ( I actually got
>  p243 at ftp://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.1-p243.tar.gz)
> 
> 2: To ensure that the installation of the necessary tools
> sudo apt-get install build-essential
> sudo apt-get install autoconf
> 
> 3:
> tar xzvf ruby-1.9.1-p0.tar.gz
> cd ruby-1.9.1-p0(actually p243)
> autoconf
> sudo makedir /opt/ruby
> ./configure --prefix=/opt/ruby --enable-pthread
> make
> sudo make install
> 
> 4 Installed?
> /opt/ruby/bin/ruby -v

yuck.

I guess you could upgrade, since it may be awhile before Ubuntu/Debian pick up 
the latest patch set. But since this is the version you'd be doing anyway, I'd 
do:

sudo rm -rf /opt/ruby

Then do this:

cd /usr/local/bin
for i in /usr/bin/*1.9.1; do sudo ln -s $i `basename $i 1.9.1`; done

And you're done.

Be aware that not everything works in 1.9.1 yet, so you may end up wanting 
some options after all.