WindowsXPã®Instant Railsç°å¢ã§gem install rmagickãããã¨ä¸è¨ã®ã¨ã©ã¼ã«ãªãã C:\InstantRails\rails_apps>gem install rmagick Building native extensions. This could take a while... ERROR: While executing gem ... (Gem::Installer::ExtensionBuildError)    ERROR: Failed to build gem native extension. ruby gem_extconf.rb install rmagick sh configure gem_extconf.rb:38: undefined method `exitstatus' for nil:NilClass
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