Am Sun, 17 Oct 2021 15:29:09 +0200
schrieb Enrico Forestieri <for...@lyx.org>:

> On Sun, Oct 17, 2021 at 02:48:31PM +0200, Enrico Forestieri wrote:
> > commit 771f30e9463d8d7bf7acd4dfc564f462b28eae16
> > Author: Enrico Forestieri <for...@lyx.org>
> > Date:   Sun Oct 17 15:06:05 2021 +0200
> > 
> >     Enable QWindowsMimeMetafile with Qt6
> >     
> >     The QWinMime class has been removed in Qt6 but the functionality
> >     is still present. However, one has to allow inclusion of private
> >     headers and register the mime handling to the QWindowsApplication
> >     native interface.  
> 
> Kornel, according to
> https://www.qt.io/blog/qt-extras-modules-in-qt-6#qwinmime
> to enable private headers with cmake one has to add a project dependency
> to Qt::GuiPrivate. I honestly don't know how to do that. This only
> matters for Windows and after this commit compilation cannot succeed
> when configuring with cmake if private headers are not enabled.
> 

My only idea is to use
        if (MINGW AND LYX_USE_QT MATCHES "QT6")
                add_dependencies(${_lyx} Qt::CorePrivate Qt::GuiPrivate)
        endif()
somewhere at src/CMakeLists.txt:125

Sorry, I am only fishing in muddy waters ...

        Kornel

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