gem install --version 2.9.1 works, --version 2.9.2 and onward fails · Issue #627 · puma/puma · GitHub
ERROR: Error installing puma: Failed to build gem native extension. OSX · Issue #1380 · puma/puma · GitHub
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ruby on rails - Puma not starting after EC2 restart,bundler: command not found: puma - Stack Overflow
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