bug in autoconf-2.64

[Mike Stump]

I'm trying to run autoconf on darwin, and it requires autoconf-2.64.  When I 
run it I wind up with extra lines in the resulting configure file:

Index: configure
===================================================================
--- configure   (revision 170335)
+++ configure   (working copy)
@@ -886,6 +886,7 @@
with_bugurl
enable_languages
with_multilib_list
+with_gnu_ld
enable_rpath
with_libiconv_prefix
enable_initfini_array
@@ -899,7 +900,9 @@
enable_static
with_pic
enable_fast_install
+with_gnu_ld
enable_libtool_lock
+with_gnu_ld
with_plugin_ld
enable_gnu_indirect_function
enable_comdat
@@ -924,9 +927,13 @@
CPPFLAGS
CXX
CXXFLAGS
+LDFLAGS
+LIBS
+CPPFLAGS
CCC
CPP
CXXCPP
+CXXCPP
GMPLIBS
GMPINC
PPLLIBS
@@ -17505,7 +17512,7 @@
  lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
  lt_status=$lt_dlunknown
  cat > conftest.$ac_ext <<_LT_EOF
-#line 17508 "configure"
+#line 17515 "configure"
#include "confdefs.h"

#if HAVE_DLFCN_H
@@ -17611,7 +17618,7 @@
  lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
  lt_status=$lt_dlunknown
  cat > conftest.$ac_ext <<_LT_EOF
-#line 17614 "configure"
+#line 17621 "configure"
#include "confdefs.h"

#if HAVE_DLFCN_H

Net result, I can't regenerate configure files anymore.  :-(  I don't know 
which files to tease out of gcc to make a nice bug report, and knowing gcc's, 
uhm, elaborate use of config files, I'm not sure I want to try.  I tried to 
update to m4-1.4.15 from m4-1.4.6, but that didn't see to fix it.  I didn't 
rebuild, reinstall autoconf after updating m4, just added it to the front of my 
path.

Any clues?