mod_evhost
mod_expire
mod_fastcgi
mod_indexfile
mod_magnetlua >5.1
mod_mysql_vhostlibmysqlclient
mod_proxy
mod_redirectlibpcre
mod_rewritelibpcre
mod_rrdtoolrrdtool
mod_scgi
mod_secure_download
mod_setenv
mod_simple_vhost
mod_ssi
mod_staticfile
mod_status
mod_trigger_b4_dllibmemcache or gdbm
mod_userdir
mod_usertrack
mod_webdavlibxml2,sqlite3

Optional libraries provide additional feature capabilities to the modules.

featurerequired libswhat?
auth-cryptcrypt() from libc/libcryptprovides htpasswd and htdigest for basic/digest auth
auth-ldaplibopenldapauth users against an ldap server
compress-bzip2libbz2optional, non-standard bzip2 compress for mod_compress
compress-deflatelibzdeflate compress for mod_compress
compress-gziplibzgzip compress for mod_compress
large-fileslibc/oslarge files support
network-ipv6libc/osipv6 support
network-openssllibopensslssl cabability
regex-conditionalslibpcre=~ and !~ in config conditionals
stat-cache-famlibfam/gamincaches stat() calls with the help of FAM
storage-gdbmlibgdbmlocal, non-cluster storage for mod_trigger_b4_dl
storage-memcachelibmemcachedistributed storage for mod_trigger_b4_dl
webdav-lockslibxml2, sqlite3, libuuidfile locking for mod_webdav
webdav-propertieslibxml2, sqlite3property storage for mod_webdav