Build from source fails with "fatal error: QFile: No such file or directory". 

// code placeholder
fatal error: QFile: No such file or directory
    9 | #include <QFile>

It is possible to replace the include line with absolute path for qfile.h then compiling will continue but then the issue comes for another file for different or same header file. 

Having this issue for 6.5.0 and 6.5.1.  I can build 6.5.0-rc without that issue.

I have tested in 2 different PCs.

This might be related that I'm getting this warning message for many different header files.

// code placeholder
WARNING: /home/user/Build/qt-everywhere-src-6.5.1/qtbase/src/corelib/tools/qvarlengtharray.h does not include QT_BEGIN_NAMESPACE