hi, below is the setup i have: Mac OS X Snow Leopard running ruby 1.8.7 installed using hivelogic procedure installed libxml2 and libxslt from source installed nokogiri 1.4.2 using sudo gems EMercados-MacBook-Pro:~ ermercado$ gem list *** LOCAL GEMS *** actionmailer (2.3.5) actionpack (2.3.5) activerecord (2.3.5) activeresource (2.3.5) activesupport (2.3.5) cgi_multipart_eof_fix (2.5.0) cheat (1.2.1) daemons (1.0.10) eventmachine (0.12.10) fastthread (1.0.7) gem_plugin (0.2.3) mongrel (1.1.5) mysql (2.8.1) nokogiri (1.4.2, 1.3.3) rack (1.0.1) rails (2.3.5) rake (0.8.7) rspec (1.2.9) rubygems-update (1.3.6) sqlite3-ruby (1.2.5) thin (1.2.4) why am i getting the following message when i issue 'require nokogiri' on irb? EMercados-MacBook-Pro:~ ermercado$ irb irb(main):001:0> require 'nokogiri' LoadError: dlopen(/usr/local/lib/ruby/gems/1.8/gems/nokogiri-1.4.2/lib/nokogiri/nokogiri.bundle, 9): no suitable image found. Did find: /usr/local/lib/ruby/gems/1.8/gems/nokogiri-1.4.2/lib/nokogiri/nokogiri.bundle: mach-o, but wrong architecture - /usr/local/lib/ruby/gems/1.8/gems/nokogiri-1.4.2/lib/nokogiri/nokogiri.bundle from /usr/local/lib/ruby/gems/1.8/gems/nokogiri-1.4.2/lib/nokogiri/nokogiri.bundle from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require' from /usr/local/lib/ruby/gems/1.8/gems/nokogiri-1.4.2/lib/nokogiri.rb:13 from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require' from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require' from (irb):1 even after issuing the below command: EMercados-MacBook-Pro:~ ermercado$ export RUBYOPT="rubygems" thanks very much for your help manny -- Posted via http://www.ruby-forum.com/.