/usr/lib/x86_64-linux-gnu/pkgconfig/gudev-1.0.pc is in libgudev-1.0-dev 1:204-5ubuntu20.
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=/usr
libdir=/usr/lib/x86_64-linux-gnu
includedir=/usr/include
Name: gudev-1.0
Description: GObject bindings for libudev
Version: 204
Requires: glib-2.0, gobject-2.0
Libs: -L${libdir} -lgudev-1.0
Cflags: -I${includedir}/gudev-1.0
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