waf.python configurable?

[Zhenfu Shi]

Hi all,
I’m working on mpv portfile but I couldn’t find a way to change {waf.python}, the python executable needed for waf. It’s currently failing to configure on buildbots. In https://trac.macports.org/ticket/57927 <https://trac.macports.org/ticket/57927> the original maker of waf portgroup said it is configurable. Anyone knows how?

Thanks,
Zhenfu
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