Within Math::Int64 look at https://metacpan.org/release/SALVA/Math-Int64-0.54/source/Makefile.PL#L46 and https://metacpan.org/release/SALVA/Math-Int64-0.54/source/Makefile.PL#L111.

In reply to Re: Best way to check for 64-bit support by marto
in thread Best way to check for 64-bit support by gflohr

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