optional_depends  iksemel                              \
                  "--enable-xmpp"                      \
                  "--disable-xmpp"                     \
                  "for support for the jabber protocol" &&
optional_depends  gnutls                               \
                  "--with-libgnutls-prefix=${INSTALL_ROOT}/usr" \
                  "--disable-ssl"                      \
                  "for encrypted connection support"  &&
optional_depends  libotr                               \
                  ""                                   \
                  "--disable-otr"                      \
                  "for encrypted connversations"
