case $MSMTP_SSL in
  gnutls) depends gnutls "--with-ssl=gnutls"
  ;;
  openssl) depends openssl "--with-ssl=openssl"
  ;;
  none)
  ;;
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 gnome-keyring \
                 "--with-gnome-keyring" \
                 "--without-gnome-keyring" \
                 "for GNOME Keyring support" &&

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