cygport compile command fails

[Achim Gratz]

Tatsuro MATSUOKA writes:
> I tried both  CXXFLAGS="-std=gnu++11" and CXXFLAGS="-std=gnu++14" to the configure but the results are the same.

It turns out this is a latent bug in Qt5 sources.  It was relying on an
implicit include chain that is no longer present in gcc-11 header files.

https://github.com/MultiMC/Launcher/issues/3574


Regards,
Achim.
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