Hi everyone, I don''t know if it''s the right place to ask you this question. Anyway, now I''m trying to install RMagick, under Ubuntu Linux, in order to have an image resizing using RubyonRails. I followed the description how to install RMagic: http://rmagick.rubyforge.org/install-linux.html Everything works, as it''s written, but during the last point (Step 3: Install RMagick) I have an error during the execution of "make", as below. --- matteod@bones:~/Programs/RMagick-1.10.1$ make /usr/local/bin/ruby install.rb config install.rb: entering config phase... ---> lib ---> lib/rvg <--- lib/rvg <--- lib ---> ext ---> ext/RMagick /usr/bin/ruby1.8 /home/matteod/Programs/RMagick-1.10.1/ext/RMagick/extconf.rb /home/matteod/Programs/RMagick-1.10.1/ext/RMagick/extconf.rb:4:in `require'': no such file to load -- mkmf (LoadError) from /home/matteod/Programs/RMagick-1.10.1/ext/RMagick/extconf.rb:4 config failed ''system /usr/bin/ruby1.8 /home/matteod/Programs/RMagick-1.10.1/ext/RMagick/extconf.rb '' failed try ''ruby install.rb --help'' for usage make: *** [config.save] Error 1 --- Does anyone suggest me the solution? What should I do? Thanks a lot! Matteo -- Posted via http://www.ruby-forum.com/.