/usr/lib/x86_64-linux-gnu/pkgconfig/QtGStreamerUi-0.10.pc is in libqtgstreamer-dev 0.10.2-2ubuntu2.
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=${prefix}
libdir=/usr/lib/x86_64-linux-gnu
includedir=/usr/include/QtGStreamer
Name: QtGStreamerUi-0.10
Description: QtGui GStreamer integration library
Requires: QtGui QtGStreamer-0.10
Version: 0.10.2
Cflags: -I${includedir}
Libs: -L${libdir} -lQtGStreamerUi-0.10
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