optional_depends "openssl" "--with-openssl"      "--without-openssl"    "to build DNSSEC part of bind-utils"
optional_depends "libxml2" "--with-libxml2"      "--without-libxml2"    "to build with libxml2 library"
optional_depends "libcap"  "--enable-linux-caps" "--disable-linux-caps" "for linux capabilities"
optional_depends "heimdal" "--with-gssapi"       "--without-gssapi"     "for heimdal support"
