diff --git a/configure.ac b/configure.ac
index ef9073e0..ddae744c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -51,6 +51,7 @@ AC_CONFIG_FILES([Makefile
 AC_DEFINE_UNQUOTED(PACKAGE_PIDFILE, LOCALSTATEDIR "/run/" PACKAGE ".pid", [The path and name of the PID file.])
 AC_DEFINE_UNQUOTED(PACKAGE_LOGFILE, LOCALSTATEDIR "/log/" PACKAGE ".log", [The path and name of the log file.])
 AC_DEFINE_UNQUOTED(PACKAGE_CONFIGPATH, SYSCONFDIR "/" PACKAGE, [The default path of the configuration files.])
+AC_DEFINE(REVISION, "[m4_esyscmd_s([git describe --always 2>/dev/null || (echo -n 'p'; date +%Y%m%d)])]", [The revision of the package.])
 
 AC_CHECK_PROGS([HAVE_DOXYGEN], [doxygen], [])
 if test -z "$HAVE_DOXYGEN"; then