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The most significant change since Ruby 1.9 is the changed path of config.h, from RbConfig::CONFIG['rubyhdrdir'] to RbConfig::CONFIG['rubyarchhdrdir'].
165f6430
The most significant change since Ruby 1.9 is the changed path of config.h, from RbConfig::CONFIG['rubyhdrdir'] to RbConfig::CONFIG['rubyarchhdrdir'].