You will need these
APACHE2_MODULES="access auth auth_dbm auth_anon auth_digest alias filter file-cache echo charset-lite cache disk-cache mem-cache ext-filter case_filter case-filter-in deflate mime-magic cern-meta expires headers usertrack unique-id proxy proxy_connect proxy_ftp proxy_http info include cgi cgid dav dav-fs vhost-alias speling rewrite log_config logio env setenvif mime status autoindex asis negotiation dir imap actions userdir so unique_id auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user disk_cache ext_filter file_cache mem_cache mime_magic vhost_alias" APACHE2_MPMS="prefork"
in
/etc/make.conf