puma gem - Failed to build gem native extension

Question

I was getting the following error while installing puma gem

    $ gem install puma
    Fetching: puma-2.11.2.gem (100%)
    Building native extensions.  This coul         


        

Answer 1

I'm on OS X 10.12.4 and the comment @mahi added worked for me:

gem install puma -v '3.6.0' -- --with-opt-dir=/usr/local/opt/openssl