/usr/lib/x86_64-linux-gnu/pkgconfig/messaging-menu.pc is in libmessaging-menu-dev 13.10.1+17.04.20170120-0ubuntu2.
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=${prefix}/include/messaging-menu
Name: Messaging Menu Library
Description: Messaging Menu client library
Version: 12.10.5
Requires: gio-unix-2.0
Libs: -L${libdir} -lmessaging-menu
Cflags: -I${includedir}
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