Looking at newer automake I noticed the autoconf version should have
been bumped with the 1.16.4 release.


Index: Makefile
===================================================================
RCS file: /cvs/ports/devel/automake/1.16/Makefile,v
retrieving revision 1.9
diff -u -p -u -p -r1.9 Makefile
--- Makefile	9 Sep 2023 12:35:16 -0000	1.9
+++ Makefile	28 Nov 2024 05:38:10 -0000
@@ -1,10 +1,11 @@
 VERSION=	1.16
 DISTNAME=	automake-${VERSION}.5
+REVISION=	0
 PKGSPEC=	automake->=${VERSION},<1.17
 EXTRACT_SUFX=	.tar.xz
 PORTROACH =
 
-AUTOCONF_VERSION=	2.69
+AUTOCONF_VERSION=	2.71
 
 post-install:
 	cd ${PREFIX}/info && mv automake.info automake${SUFFIX}.info