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https://github.com/openssl/openssl/commit/bfa470a4f64313651a35571883e235d3335054eb
Between the option of using openssl config files and compiling my own version of openssl that has that feature...
The compile is running right now.
They renamed it -addext, apparently. Huh.
(Even after compiling several versions of openssl, I was never able to get this feature to work. I eventually gave up and used config files T_T)