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Thanks to Rachel Chasin for writing up an initial set of instructions at https://phantomcolumnist.blogspot.com/2014/09/installing-sdplayer-200-on-osx.html, which this set of instructions is based upon.
Alex Dehnert also has a GitHub repo that builds SdPlayer using GitHub Actions and links to built outputs (there's also Qt5 builds for Linux as a .deb and a snap there).