/usr/lib/x86_64-linux-gnu/pkgconfig/libcanberra-gtk.pc is in libcanberra-gtk-dev 0.30-5ubuntu1.
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=${prefix}/include
Name: libcanberra-gtk
Description: Gtk Event Sound API
Version: 0.30
Libs: -L${libdir} -lcanberra-gtk -lX11
Cflags: -D_REENTRANT -I${includedir}
Requires: libcanberra gdk-2.0 gtk+-2.0
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