apache2-ssl-dev 2.4.41-4ubuntu3.4 (armhf binary) in ubuntu focal

 The Apache HTTP Server Project's goal is to build a secure, efficient and
 extensible HTTP server as standards-compliant open source software. The
 result has long been the number one web server on the Internet.
 .
 This package provides the development header and the dependencies for
 modules that interact with mod_ssl's internal openssl state.