gem eventmachine fatal error: ‘openssl/ssl.h’ file not found

by 
$ gem install eventmachine -- --with-cppflags=-I/usr/local/opt/openssl/include                                                                                                             
Building native extensions with: '--with-cppflags=-I/usr/local/opt/openssl/include'
This could take a while...
Successfully installed eventmachine-1.0.8
1 gem installed

You can also set up bundler like this but I think that is superficial

bundle config build.eventmachine --with-cppflags=-I/usr/local/opt/openssl/include

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