Gem dependency errors

Depending on which gems you’re using together with a specific Ruby version, you may see dependency issues such as:

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
/usr/local/bin/ruby extconf.rb
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.

This may happen with a gem such as debugger, which is designed to hook into low level components of a language to dynamically stop and inspect the execution of code.

  1. This should not be done in production, so you could start by moving the gem to your development group in your Gemfile:

  2. group :development do
      gem "debugger"

    Once this is done, run bundle install, commit to your Git and re-deploy.

  3. You may be running an old version of a gem while running a later version of Ruby - try running bundle update debugger to update the gem. Your other option is to downgrade your Ruby version.

  4. You could investigate what dependencies are required by running gem install debugger on the server, and taking note of the required packages. You could then use a manifest file or deploy hooks to automate the installation of these packages as you scale.

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