/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5GStreamerQuick-1.0.pc is in libqt5gstreamer-dev 1.2.0-3.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include/Qt5GStreamer
Name: Qt5GStreamerQuick-1.0
Description: QtQuick GStreamer integration library
Requires: Qt5Quick Qt5GStreamer-1.0
Version: 1.2.0
Cflags: -I${includedir}
Libs: -L${libdir} -lQt5GStreamerQuick-1.0
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