libnfnetlink-dev 1.0.1-3build1 (i386 binary) in ubuntu focal

 libnfnetlink is the low-level library for netfilter related
 kernel/userspace communication. It provides a generic messaging
 infrastructure for in-kernel netfilter subsystems (such as
 nfnetlink_log, nfnetlink_queue, nfnetlink_conntrack) and their
 respective users and/or management tools in userspace.
 .
 This package provides development files and static libraries.