+ my $early_m4_code .= "m4_define([m4_require_silent_probe], [-])";
+
+ my $traces = ($ENV{AUTOM4TE} || '@am_AUTOM4TE@');
+ $traces .= " --language Autoconf-without-aclocal-m4 ";
+ $traces = "echo '$early_m4_code' | $traces - ";
+
+ # Support AC_CONFIG_MACRO_DIRS also with older autoconf.
+ # Note that we can't use '$ac_config_macro_dirs_fallback' here, because
+ # a bug in option parsing code of autom4te 2.68 and earlier will cause
+ # it to read standard input last, even if the "-" argument is specified
+ # early.
+ # FIXME: To be removed in Automake 2.0, once we can assume autoconf
+ # 2.70 or later.
+ $traces .= "$automake_includes[0]/internal/ac-config-macro-dirs.m4 ";
+