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As reported in <https://bugs.ruby-lang.org/issues/21340>, older autoconf have an AC_HEADER_STDBOOL that's incompatible with C23. Autoconf 2.72 fixed the macro, but also mentions that it's obsolescent since all current compilers have this header. Since we require C99 [1] and VS 2015 [2], we might actually be able take that suggestion and include stdbool.h without a check. I want to try this on rubyci.org and will revert if this cause any issues. Not touching AC_HEADER_STDBOOL in configure.ac for now. [1]: https://bugs.ruby-lang.org/issues/15347 [2]: https://bugs.ruby-lang.org/issues/19982