/usr/lib/x86_64-linux-gnu/pkgconfig/dfu.pc is in libdfu-dev 0.7.0-0ubuntu4.
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=${prefix}/include
Name: dfu
Description: libdfu is a library for reading and writing USB device firmware
Version: 0.7.0
Requires: glib-2.0, gobject-2.0, gio-2.0
Libs: -L${libdir} -ldfu
Cflags: -I${includedir}
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