diff -ur postgresql-16.1.orig/configure.ac postgresql-16.1/configure.ac
--- postgresql-16.1.orig/configure.ac	2023-12-13 21:53:31.585066083 +0100
+++ postgresql-16.1/configure.ac	2023-12-13 21:54:44.023989230 +0100
@@ -19,10 +19,6 @@
 
 AC_INIT([PostgreSQL], [16.2], [pgsql-bugs@lists.postgresql.org], [], [https://www.postgresql.org/])
 
-m4_if(m4_defn([m4_PACKAGE_VERSION]), [2.69], [], [m4_fatal([Autoconf version 2.69 is required.
-Untested combinations of 'autoconf' and PostgreSQL versions are not
-recommended.  You can remove the check from 'configure.ac' but it is then
-your responsibility whether the result works or not.])])
 AC_COPYRIGHT([Copyright (c) 1996-2023, PostgreSQL Global Development Group])
 AC_CONFIG_SRCDIR([src/backend/access/common/heaptuple.c])
 AC_CONFIG_AUX_DIR(config)