開発環境のMac OS X(10.5/Leopard)で、Rails 2.3.3をインストールしようとしたところ、gem updateで失敗したので環境を再考。 % gem list % sudo gem update Updating rmagick Building native extensions. This could take a while... ERROR: While executing gem ... (Gem::Installer::ExtensionBuildError) ERROR: Failed to build gem native extension. /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb update checking for Ruby