libselinux1-dev binary package in Ubuntu Focal arm64

 This package provides the static libraries and header files
 needed for developing SELinux applications. Security-enhanced Linux
 is a patch of the Linux kernel and a number of utilities with
 enhanced security functionality designed to add mandatory access
 controls to Linux. The Security-enhanced Linux kernel contains new
 architectural components originally developed to improve the security
 of the Flask operating system. These architectural components provide
 general support for the enforcement of many kinds of mandatory access
 control policies, including those based on the concepts of Type
 Enforcement, Role-based Access Control, and Multi-level Security.

Source package