Rails - Sep 2011 - Instalation help

Hi guys, my first post :D

I have a problem installing rails

Building native extensions.  This could take a while...
ERROR:  Error installing rails:
	ERROR: Failed to build gem native extension.

        /usr/bin/ruby1.9.1 extconf.rb
extconf.rb:36:in `require'': no such file to load -- mkmf (LoadError)
	from extconf.rb:36:in `<main>''


Gem files will remain installed in /usr/lib/ruby/gems/1.9.1/gems/
bcrypt-ruby-3.0.1 for inspection.
Results logged to /usr/lib/ruby/gems/1.9.1/gems/bcrypt-ruby-3.0.1/ext/
mri/gem_make.out

someone help me ..

Thank you very much

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

> Building native extensions.  This could take a while...
> ERROR:  Error installing rails:
>        ERROR: Failed to build gem native extension.
>
>        /usr/bin/ruby1.9.1 extconf.rb
> extconf.rb:36:in `require'': no such file to load -- mkmf
(LoadError)
>        from extconf.rb:36:in `<main>''
For me it helped to install the source-packages of ruby and its dependencies.

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.