+dnl GiNaC archive file version information.
+dnl
+dnl If properties have been added, ARCHIVE_VERSION += 1, ARCHIVE_AGE += 1.
+dnl If backwards compatibility has been broken, set ARCHIVE_AGE to 0.
+dnl
+dnl The version number in newly created archives will be ARCHIVE_VERSION.
+dnl Archives version (ARCHIVE_VERSION-ARCHIVE_AGE) thru ARCHIVE_VERSION can
+dnl be read by this version of the GiNaC library.
+
+ARCHIVE_VERSION=1
+ARCHIVE_AGE=1
+
+AC_SUBST(ARCHIVE_VERSION)
+AC_SUBST(ARCHIVE_AGE)
+AC_DEFINE_UNQUOTED(ARCHIVE_VERSION, $ARCHIVE_VERSION)
+AC_DEFINE_UNQUOTED(ARCHIVE_AGE, $ARCHIVE_AGE)
+