diff --git a/.tarball-version b/.tarball-version
new file mode 100644
index 0000000..49d5957
--- /dev/null
+++ b/.tarball-version
@@ -0,0 +1 @@
+0.1
diff --git a/configure.ac b/configure.ac
index 3bc6a65..a605f34 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,70 +1,70 @@
 dnl Process this file with autoconf to produce a configure script.
 dnl
 dnl This file is free software; as a special exception the author gives
 dnl unlimited permission to copy and/or distribute it, with or without
 dnl modifications, as long as this notice is preserved.
 dnl
 dnl This program is distributed in the hope that it will be useful, but
 dnl WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
 dnl implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
 AC_INIT([Je suis GPL],
-	[0.1],
+	[m4_esyscmd_s([cat .tarball-version])],
 	[swh-devel@inria.fr],
 	[jesuisgpl],
 	[https://forge.softwareheritage.org/source/jesuisgpl/])
 
 dnl Must come before AM_INIT_AUTOMAKE.
 AC_CONFIG_AUX_DIR([build-aux])
 AM_INIT_AUTOMAKE([
 	1.11.1
 	readme-alpha
 	subdir-objects
 ])
 
 dnl Minimum Autoconf version required.
 AC_PREREQ([2.62])
 
 dnl Where to generate output; srcdir location.
 AC_CONFIG_HEADERS([config.h:config.in])dnl Keep filename to 8.3 for MS-DOS.
 AC_CONFIG_SRCDIR([src/hello.c])
 
 dnl Checks for programs.
 dnl We need a C compiler.
 AC_PROG_CC
 
 dnl Since we use gnulib: gl_EARLY must be called as soon as possible after
 dnl the C compiler is checked.  The others could be later, but we just
 dnl keep everything together.
 gl_EARLY
 gl_INIT
 
 dnl Copyright will apply as long as these sources are in use, e.g., are
 dnl being compiled, which is reasonable year to claim the copyright.
 AC_DEFINE([COPYRIGHT_YEAR], [m4_esyscmd([date +%Y])], [year in copyright message])
 
 dnl Are we building from git checked-out sources, or a tarball ?
 dnl This is used in "Makefile.am" to avoid re-generating the manpage
 dnl when building from tarballs.
 AM_CONDITIONAL([BUILD_FROM_GIT], [test -d "$srcdir/.git"])
 AM_CONDITIONAL([GIT_CROSS_COMPILING],
                [test -d "$srcdir/.git" && test $cross_compiling = yes])
 
 dnl GNU help2man creates man pages from --help output; in many cases, this
 dnl is sufficient, and obviates the need to maintain man pages separately.
 dnl However, this means invoking executables, which we generally cannot do
 dnl when cross-compiling, so we test to avoid that (the variable
 dnl "cross_compiling" is set by AC_PROG_CC).
 AS_IF([test $cross_compiling = no], [
   AM_MISSING_PROG([HELP2MAN], [help2man])
 ], [
   HELP2MAN=:
 ])
 
 dnl i18n support from GNU gettext.
 AM_GNU_GETTEXT_VERSION([0.18.1])
 AM_GNU_GETTEXT([external])
 
 AC_CONFIG_FILES([Makefile
            po/Makefile.in])
 AC_OUTPUT