/usr/lib/pkgconfig/libkres.pc is in libkres-dev 2.1.1-1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib
includedir=/usr/include
Name: libkres
Description: Knot DNS Resolver library
URL: https://www.knot-resolver.cz
Version: 2.1.1
Libs: -L${libdir} -lkres
Cflags: -I${includedir}
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