[arm64] FTBFS: out of date config.{sub,guess}

ubuntu@arm64:~/djvulibre-3.5.25.4$ DEB_BUILD_OPTIONS="parallel=8" dpkg-buildpackage -rfakeroot -uc -us -B
dpkg-buildpackage: source package djvulibre
dpkg-buildpackage: source version 3.5.25.4-1
dpkg-buildpackage: source changed by Barak A. Pearlmutter <email address hidden>
dpkg-buildpackage: host architecture arm64
 dpkg-source --before-build djvulibre-3.5.25.4
 fakeroot debian/rules clean
dh clean --with autoreconf --parallel
   dh_testdir -O--parallel
   dh_auto_clean -O--parallel
   dh_autoreconf_clean -O--parallel
   dh_clean -O--parallel
 debian/rules build-arch
dh build-arch --with autoreconf --parallel
   dh_testdir -a -O--parallel
   dh_autoreconf -a -O--parallel
libtoolize: putting auxiliary files in AC_CONFIG_AUX_DIR, `config'.
libtoolize: copying file `config/ltmain.sh'
libtoolize: putting macros in AC_CONFIG_MACRO_DIR, `config'.
libtoolize: copying file `config/libtool.m4'
libtoolize: copying file `config/ltoptions.m4'
libtoolize: copying file `config/ltsugar.m4'
libtoolize: copying file `config/ltversion.m4'
libtoolize: copying file `config/lt~obsolete.m4'
libtoolize: Consider adding `-I config' to ACLOCAL_AMFLAGS in Makefile.am.
   debian/rules override_dh_auto_configure
make[1]: Entering directory `/home/ubuntu/djvulibre-3.5.25.4'
dh_auto_configure -- --disable-desktopfiles --enable-static --enable-shared CXXFLAGS=-g
configure: WARNING: unrecognized options: --disable-maintainer-mode, --disable-dependency-tracking
checking build system type... Invalid configuration `aarch64-linux-gnu': machine `aarch64' not recognized
configure: error: /bin/bash config/config.sub aarch64-linux-gnu failed