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(Debian squeeze) rvm version: 1.10.0

I have just installed ruby 1.9.2-p290 using "rvm install 1.9.2" and made it default. However, I am getting this error when trying to install rails using rubygems. "gem install rails" worked fine on my system ruby installation.

root:/usr/bin# rvm list

rvm rubies

=> ruby-1.9.2-p290 [ i686 ]

root:/usr/bin# rvm current ruby-1.9.2-p290 root:/usr/bin# gem list

* LOCAL GEMS *

root:/usr/bin# gem install rails ERROR: Loading command: install (LoadError) no such file to load -- zlib

ERROR: While executing gem ... (NameError) uninitialized constant Gem::Commands::InstallCommand

I have tried the instructions on this other page: https://stackoverflow.com/questions/2441248/rvm-ruby-1-9-1-troubles, (apt-get install zlib, reinstalling 1.9.2 on rvm), but that didn't seem to work. Any ideas of what might be the root problem?

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You need to install the dev package for zlib before installing ruby with rvm. Assuming you are using Debian or Ubuntu,

apt-get install zlib1g-dev rvm remove 1.9.2 rvm install 1.9.2

should do it.

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