case $MSMTP_SSL in
  gnutls) depends gnutls "--with-tls=gnutls"
  ;;
  SSL) depends openssl "--with-tls=openssl"
  ;;
  none) OPTS="--with-tls=no $OPTS"
  ;;
esac &&

optional_depends gsasl \
                 "--with-libgsasl" \
                 "--without-libgsasl" \
                 "to use GNU SASL authentication library" &&

optional_depends libidn \
                 "--with-libidn" \
                 "--without-libidn" \
                 "for IDN support" &&

optional_depends libsecret \
                 "--with-libsecret" \
                 "--without-libsecret" \
                 "for GNOME password management support" &&

optional_depends GETTEXT \
                 "--enable-nls" \
                 "--disable-nls" \
                 "for Native Language Support"
