/usr/lib/x86_64-linux-gnu/pkgconfig/liblightdm-qt-3.pc is in liblightdm-qt-dev 1.18.1-0ubuntu1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: liblightdm-qt
Description: LightDM Qt4 client library
Version: 1.18.1
Requires: QtCore QtGui
Libs: -L${libdir} -llightdm-qt-3
Cflags: -I${includedir}/lightdm-qt-3
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