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From: Achim Gratz <Stromeko@nexgo.de>
To: cygwin@cygwin.com
Subject: Re: cygport compile command fails
References: <42772227.153689.1639737354375.JavaMail.yahoo.ref@mail.yahoo.co.jp>
 <42772227.153689.1639737354375.JavaMail.yahoo@mail.yahoo.co.jp>
Date: Sat, 18 Dec 2021 11:19:52 +0100
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 (Tatsuro MATSUOKA's message of "Fri, 17 Dec 2021 19:35:54 +0900
 (JST)")
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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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