/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5X11Extras.pc is in libqt5x11extras5-dev 5.9.5-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include/x86_64-linux-gnu/qt5
Name: Qt5 X11Extras
Description: Qt X11Extras module
Version: 5.9.5
Libs: -lQt5X11Extras
Cflags: -I${includedir}/QtX11Extras -I${includedir}
Requires: Qt5Core Qt5Gui
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