作業メモ。 OS:Ubuntu8.04 $ sudo apt-get install graphicsmagick libgraphicsmagick1 libgraphicsmagick1-dev libgraphicsmagick++1-dev libgraphicsmagick++1 $ sudo gem install rmagick Building native extensions. This could take a while... ERROR: Error installing rmagick: ERROR: Failed to build gem native extension. /usr/bin/ruby1.8 extconf.rb install rmagick checking for Ruby version >= 1.8.2... yes checking