From: Rajinder Yadav <devguy.ca@...>
Date: 2010-10-25T16:35:39+09:00
Subject: Re: problem with ruby1.9.2 and gems on Debian

On 10-10-24 04:17 PM, Jen wrote:
> Hi,
> I installed rubygems 1.3.7, then decided to upgrade from ruby1.8 to
> ruby1.9.2.
>
> I forgot to uninstall rubygems before installing ruby1.9.2, as I didn't
> realise gems came with it.
>
> Now I want to install some gems, but when I run 'gem install rails' I
> get the following error.
>
> ERROR: Loading command: install (LoadError)
> no such file to load -- zlib
> ERROR: While executing gem ... (NameError)
> uninitialized constant Gem::Commands::InstallCommand
>
> Can I repare 'gems? If not should I remove ruby1.9.2, rubygems1.3.7 and
> start again?
>
> It may be worth mentioning that I built these packages on Debian Lenny
> from source, and they are not in the database used by 'apt' etc.
>
> I have tried removing all traces of Ruby and rubygems from the system,
> then rebuilding and installing ruby1.9.2
>
> Thanks,
> Jen.
>
>
possibly you just need to do the following to add the missing zlib 
header files:

sudo aptitude install zlib1g-dev

you might also want to add these header files(if you have not already)

sudo aptitude install libc6-dev libssl-dev
sudo aptitude install libreadline6-dev zlib1g-dev libsqlite3-dev

once you have a working ruby install rails and sqlite3

sudo gem install rails
sudo gem install sqlite3-ruby

-- 
Kind Regards,
Rajinder Yadav | DevMentor.org | Do Good! ~ Share Freely

GNU/Linux: 2.6.35-22-generic
Kubuntu x86_64 10.10 | KDE 4.5.1
Ruby 1.9.2p0 | Rails 3.0.1