/usr/lib/x86_64-linux-gnu/pkgconfig/libu1db-qt5.pc is in libu1db-qt5-dev 0.1.5+15.10.20150826.1-0ubuntu1.
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 12 | prefix=/usr
exec_prefix=/usr
libdir=${exec_prefix}/lib
includedir=${prefix}/
Name: u1db-qt5
Description: Qt binding and QML plugin for U1DB.
Version: 1.0
Requires: Qt5Core Qt5Network Qt5Quick Qt5Sql
Libs: -L${libdir} -lu1db-qt5
Cflags: -I${includedir}
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