/usr/lib/x86_64-linux-gnu/pkgconfig/libnotify.pc is in libnotify-dev 0.7.6-2.
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=${prefix}/include
Name: libnotify
Description: Notifications Library
Version: 0.7.6
Requires: gdk-pixbuf-2.0 glib-2.0 >= 2.26.0 gio-2.0 >= 2.26.0
Libs: -L${libdir} -lnotify
Cflags: -I${includedir}
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