C89 conformance (old ANSI standard) #166
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C89 is the most portable C implementation, even in 2021. Everything from FFI to compiler support is better on C89 than any newer standard. Conformance isn"t difficult, but the first time around does require some brain-numbing reshuffling of code. I"ve done a portion of it, and will finish it (just @ tag me if you want it).