A problem with mongrel install

hi all:
when i install mongrel

Building native extensions. This could take a while…
extconf.rb:1:in `require’: no such file to load – mkmf (LoadError)
from extconf.rb:1

ERROR: Error installing gem mongrel-0.3.13.3.gem[.gem]: ERROR: Failed
to build gem native extension.
Gem files will remain installed in
/usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.3 for inspection.

On 9/16/06, ¸»Àö±ý¸É [email protected] wrote:

/usr/lib/ruby/gems/1.8/gems/mongrel-0.3.13.3 for inspection.
Are you on Debian or something equally hostile to Ruby?

Make sure you’ve installed ruby-dev or its equivalent.

-austin