On 30.04.2019 15:56, Pedro Alves wrote:
>  - IIRC, Cygwin uses the same w32api headers as mingw.org.  I don't know
>    whether Cygwin sets _WIN32_WINNT to a higher number already; we
>    haven't heard any complaints, so I guess it does.
> 

Cygwin uses mingw-w64.