diff -ur postgresql-10.20.orig/configure.in postgresql-10.20/configure.in
--- postgresql-10.20.orig/configure.in	2022-02-07 22:21:57.000000000 +0100
+++ postgresql-10.20/configure.in	2022-04-04 18:29:38.565774510 +0200
@@ -19,10 +19,6 @@
 
 AC_INIT([PostgreSQL], [10.20], [pgsql-bugs@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.in' but it is then
-your responsibility whether the result works or not.])])
 AC_COPYRIGHT([Copyright (c) 1996-2017, PostgreSQL Global Development Group])
 AC_CONFIG_SRCDIR([src/backend/access/common/heaptuple.c])
 AC_CONFIG_AUX_DIR(config)