Use RbConfig to locate libprism and headers when it is a default gem

ruby / prism

Prism Ruby parser

https://ruby.github.io/prism/

MIT License

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Closed eregon closed 1 week ago

eregon commented 1 week ago

This is notably necessary on TruffleRuby, which is updating to Ruby 3.3 which introduces Prism as a default gem.
Using the existing path is not an option as it would end up in truffleruby/lib/build/libprism.so and "truffleruby/lib/include/#{header}" which are not good places for such files.