Sed script for post-processing the trace output of subordinate configures.

diff --git a/config/ac-help.sed b/config/ac-help.sed
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+# Sed script for post-processing the trace output of subordinate configures.
+# Copyright (C) 2003, 2005 Free Software Foundation, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+# Replace invocations of some libtool macros.
+s|.AC_ENABLE_SHARED_DEFAULT.|yes|g
+s|.AC_ENABLE_STATIC_DEFAULT.|yes|g
+s|.AC_ENABLE_FAST_INSTALL_DEFAULT.|yes|g
+# Avoid loss of brackets, such as  --with-tags[=TAGS] => --with-tags=TAGS
+s|\[=TAGS\]|@<:@=TAGS@:>@|g
+s|\[=PKGS\]|@<:@=PKGS@:>@|g
+# Avoid unwanted comma, such as  [default=use both] => [default=use], [both]
+s|\[default=use both\]|@<:@default=use both@:>@|g