/usr/lib/pkgconfig/libdkim.pc is in libdkim-dev 1:1.0.21-3.
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 12 | prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: libdkim
Description: DomainKeys Identified Mail library from Alt-N Inc.
Version: 1.0.21
Requires.private: libcrypto
Libs: -L${libdir} -ldkim
Libs.private: -lresolv
Cflags: -I${includedir}
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