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Re:Buck – A build system developed and used by Facebook by nickspacek on Tuesday March 14, 2017 @09:01AM (#13867128)
What about it doesn't support Windows? Not disagreeing since I haven't used it much and I'm on Linux, but they have "Quick Start" instructions for Windows.

https://buckbuild.com/setup/getting_started.html

Re:Buck – A build system developed and used by Facebook by sdwilsh on Tuesday March 14, 2017 @12:03PM (#13868667)
I don't believe c++ support exists yet for Windows (although it works if you are targeting Android).