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Clang 16 (c++20) build in CI fails:
https://github.com/pisa-engine/pisa/actions/runs/7865449374/job/21458386783
65.16 -- Compiling and running to test HAVE_POSIX_REGEX
65.20 -- Performing Test HAVE_POSIX_REGEX -- failed to compile
Clang 16 (c++20) build in CI fails:
https://github.com/pisa-engine/pisa/actions/runs/7865449374/job/21458386783
65.16 -- Compiling and running to test HAVE_POSIX_REGEX
65.20 -- Performing Test HAVE_POSIX_REGEX -- failed to compile