In Network Security with OpenSSL, what is the purpose of -extfile directive, and where is the example input file "myopenssl.cnf"?

In the box on pages 124-5 describing how to create files needed by examples there is a reference to "-extfile myopenssl.cnf" that I've been unable to find in the book. I set the OPENSSL_CONF symbol to point top my configuration and left out the -extfile directive, but I'm not sure that is correct.
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