/usr/lib/x86_64-linux-gnu/pkgconfig/libusb-1.0.pc is in libusb-1.0-0-dev 2:1.0.9~rc3-2ubuntu1.
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=${prefix}/include
Name: libusb-1.0
Description: C API for USB device access from Linux, Mac OS X and Windows userspace
Version: 1.0.9-rc3
Libs: -L${libdir} -lusb-1.0
Libs.private: -lrt -pthread
Cflags: -I${includedir}/libusb-1.0
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