Instalar rubyonrails

["Felix Perez" <felix.listadebian@gmail.com>]

Hola amigos.

A sugerencias de Iñaki,me decidi a probar rubyonrails, lo he instalado
compilando la version 1.8.4, pero luego cuando intento instalar gems,
me arroja el siguiente error:

As of RubyGems 0.8.0, library stubs are no longer needed.
Searching $LOAD_PATH for stubs to optionally delete (may take a while)...
...done.
No library stubs found.

/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`gem_original_require': no such file to load -- zlib (LoadError)
       from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`require'
       from /usr/local/lib/ruby/site_ruby/1.8/rubygems/package.rb:9
       from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`require'
       from /usr/local/lib/ruby/site_ruby/1.8/rubygems/builder.rb:7
       from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`require'
       from /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb:93:in `manage_gems'
       from /home/felix/rubygems-0.9.0/./post-install.rb:70:in
`install_sources'
       from /home/felix/rubygems-0.9.0/./post-install.rb:81:in `try_run_hook'
       from setup.rb:577:in `run_hook'
       from setup.rb:1315:in `exec_task_traverse'
       from setup.rb:1168:in `exec_install'
       from setup.rb:887:in `exec_install'
       from setup.rb:705:in `invoke'
       from setup.rb:674:in `invoke'
       from setup.rb:1352

He buscado en google, pero la verdad que no le hayo respuesta, he
modificado el PATH, pero nada.

Alguna ayuda por favor.

De antemano gracias.

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