Curb installation problem on WinXp. Please Help

Hello all,

I am a new commer in the world of ruby. I have interest on web scraping.
So I download curb and try to install it on my winxp pc. but it give me
the following error:

C:>gem install curb

Need to update 1 gems from
Building native extensions. This could take a while…
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.

Provided configuration options:

ERROR: While executing gem … (RuntimeError)
ERROR: Failed to build gem native extension.
Gem files will remain installed in
c:/ruby/lib/ruby/gems/1.8/gems/curb-0.1.2 for

Results logged to

Is there any one who help me on this issu?