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(For example, this change in Rails 4.1 would have caused us hours of pain if we hadn’t known to watch for it.) But more than that, the upgrade guide will explain you should make those changes.And that’s important, because it helps you understand which of its suggestions you should follow, and which you can ignore./usr/local/rvm/rubies/ruby-1.9.3-p392/bin/ruby *** failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. --curdir --ruby=/usr/local/rvm/rubies/ruby-1.9.3-p392/bin/ruby --with-atomic_reference-dir --without-atomic_reference-dir --with-atomic_reference-include --without-atomic_reference-include=$/include --with-atomic_reference-lib --without-atomic_reference-lib=$/lib /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/mkmf.rb:381:in `try_do': The compiler failed to generate an executable file.(Runtime Error) You have to install development tools first.
Whether you’re facing a quick upgrade or a painful one, these steps will help you get your app to Rails 4.2 as smoothly as possible.https://github.com/itume/docker-quick-start-rails This is the first time for me to running Rails on Docker. With the new release of 2.2.2 I want to migrate to the new version.Is there anything I need to change to migrate my 2.1.1 controllers, views, and models?There aren't any major changes in the way things are done.