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. -- Posted via http://www.ruby-forum.com/.