Thin and Puma fail with similar issues - ERROR: Failed to build gem native extension on Mac with OpenSSL@1.1

Question

Describe the bug I have tried to do a gem install puma and gem install thin and get an error.

I have a brand new Mac that I

Answer 1

bundle config build.thin --with-cflags="-Wno-error=implicit-function-declaration"

opened https://github.com/macournoyer/thin/issues/370 to get it fixed or documented in thin