/usr/lib/x86_64-linux-gnu/pkgconfig/gusb.pc is in libgusb-dev 0.1.6-5.
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=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: gusb
Description: GUsb is a GLib binding for libusb1
Version: 0.1.6
Requires.private: gthread-2.0
Requires: glib-2.0, gobject-2.0, libusb-1.0
Libs: -L${libdir} -lgusb
Cflags: -I${includedir}/gusb-1
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