Hi,

I want to give a try to nokogiri with mechanize as it seems to have
encoding methods.

I run ubuntu heron and installed the libraries libxslt1-dev libxml2
libxml2-dev.

now when i run sudo gem install nokogiri i get this error log:

ruby extconf.rb install nokogiri-1.1.1.gem
extconf.rb:3:in `require': no such file to load -- mkmf (LoadError)
  from extconf.rb:3

I don't get what's missing here?

thanks for comments.
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