Curb error

[lemiskis]

I'm trying to install locally with the tutorial and i get this when I do the last command:

Could not find curb-0.7.8 in any of the sources

Then I try to install curb with a sudo gem1.8 install curb, this happens:

ERROR: Error installing curb:
ERROR: Failed to build gem native extension.

    /usr/bin/ruby1.8 extconf.rb

extconf.rb:1:in `require': no such file to load -- mkmf (LoadError)
from extconf.rb:1

So, I'm stuck here. Don't know what I'm doing wrong...
Thanks in advance!

[DNNX]

please share your mkmf.log

[lemiskis]

http://www.4shared.com/get/9RecoPJk/mkmf.html

[DNNX]

According to your mkmf.log, curb-0.7.8 requires ruby 1.9:

But you're using Ruby 1.8.

Could you try Ruby 1.9?