+dnl bump revision when fixing bugs
+dnl bump current and age, reset revision to zero when adding APIs
+dnl bump current, leave age, reset revision to zero when changing/removing APIS
+LIBT_CURRENT=4
+LIBT_REVISION=0
+AC_SUBST(LIBT_CURRENT)
+AC_SUBST(LIBT_REVISION)
+LIBT_AGE=3