Merge rkalimullin@work.mysql.com:/home/bk/mysql-4.1

into mysql.r18.ru:/usr/home/ram/work/mysql-4.1

bdb/dist/configure.ac

@@ -17,6 +17,9 @@ AC_MSG_CHECKING(if building in the top-level directory)
 Berkeley DB cannot be built in the top-level distribution directory.])
 AC_MSG_RESULT(no)
 
+# Minimum autoconf version required.
+AC_PREREQ(2.53)
+
 # Substitution variables.
 AC_SUBST(ADDITIONAL_INCS)
 AC_SUBST(ADDITIONAL_LANG)