/usr/lib/x86_64-linux-gnu/qt5/mkspecs/features/qwtmathml.prf is in libqwt-qt5-dev 6.1.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Qwt Widget Library
# Copyright (C) 1997 Josef Wilgen
# Copyright (C) 2002 Uwe Rathmann
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the Qwt License, Version 1.0
################################################################
include ( ./qwtconfig.pri )
include ( ./qwtfunctions.pri )
contains(QWT_CONFIG, QwtDll) {
DEFINES *= QWT_DLL
}
QT *= xml
contains(QWT_CONFIG, QwtFramework) {
INCLUDEPATH *= $${QWT_INSTALL_LIBS}/qwtmathml.framework/Headers
}
else {
INCLUDEPATH *= $${QWT_INSTALL_HEADERS}
}
qwtAddLibrary($${QWT_INSTALL_LIBS}, qwtmathml)
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