The file is copied from felixbuenemann/openssl-1.0.2u-darwin-arm64.patch. The patch backlinks to [email protected] and creats a work around to for the package to be compiled on Mac's flavour of CLang. I had to install [email protected] to be able to install older 2.3.x versions of Ruby.
Flowing are the steps to install Ruby 2.3.1 on Silicon Mac
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Download the [email protected] formulae
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Install it using: brew install ~/Downloads/[email protected]
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Once the installation finishes install Ruby using using rvm, I am using rvm after banging my head with rbenv and running into issues with gems but nevertheless rbenv works fine as well.
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CPPFLAGS=-DUSE_FFI_CLOSURE_ALLOC rvm_rubygems_version=2.7.3 rvm reinstall ruby-2.3.1 --with-openssl-dir=/usr/local/Cellar/[email protected]/1.0.2u --with-openssl-lib=/usr/local/Cellar/[email protected]/1.0.2u/lib --with-openssl-include=/usr/local/Cellar/[email protected]/1.0.2u/include -
Once the installation finishes, run rvm list and there you have it. It however show [broken] next to the version but it still worked fine for me.
Good Luck!