--- bin/autoreconf.in.orig	2026-03-18 13:15:05 UTC
+++ bin/autoreconf.in
@@ -1184,6 +1184,7 @@ parse_args;
 
 # Autoreconf all the given configure.ac.  Unless '--no-recursive' is passed,
 # AC_CONFIG_SUBDIRS will be traversed in &autoreconf_current_directory.
+$ENV{'AUTOCONF'} = $C{autoconf};
 $ENV{'AUTOM4TE'} = $C{autom4te};
 for my $directory (@ARGV)
   {