This file is indexed.

/usr/lib/x86_64-linux-gnu/pkgconfig/libusb-1.0.pc is in libusb-1.0-0-dev 2:1.0.17-1ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include

Name: libusbx-1.0
Description: C API for USB device access from Linux, Mac OS X, Windows and OpenBSD/NetBSD userspace
Version: 1.0.17
Libs: -L${libdir} -lusb-1.0
Libs.private: -ludev  -pthread
Cflags: -I${includedir}/libusb-1.0