Move to here from configure.in.

configure.ac

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+dnl autoconf configuration for gperf
+
+dnl Copyright (C) 1998, 2002, 2003, 2005-2006 Free Software Foundation, Inc.
+dnl Written by Douglas C. Schmidt <schmidt@ics.uci.edu>
+dnl and Bruno Haible <bruno@clisp.org>.
+dnl
+dnl This file is part of GNU GPERF.
+dnl
+dnl GNU GPERF is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; either version 2, or (at your option)
+dnl any later version.
+dnl
+dnl GNU GPERF is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+dnl GNU General Public License for more details.
+dnl
+dnl You should have received a copy of the GNU General Public License
+dnl along with this program; see the file COPYING.
+dnl If not, write to the Free Software Foundation, Inc.,
+dnl 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+AC_INIT(doc/gperf.1)
+AC_PROG_MAKE_SET
+AC_OBJEXT
+AC_EXEEXT
+
+dnl An autoconf-2.52 bug: AC_CONFIG_SUBDIRS requires AC_CONFIG_AUX_DIR_DEFAULT.
+ac_aux_dir=$srcdir
+AC_PROVIDE([AC_CONFIG_AUX_DIR_DEFAULT])
+AC_CONFIG_SUBDIRS(lib src tests doc)
+
+dnl This piece of sed script replaces every line containing '@subdir@'
+dnl by several consecutive lines, each referencing one subdir.
+extrasub="$extrasub"'
+/@subdir@/{
+h
+g
+s/@subdir@/lib/
+p
+g
+s/@subdir@/src/
+p
+g
+s/@subdir@/tests/
+p
+g
+s/@subdir@/doc/
+p
+d
+}
+'
+AC_OUTPUT(Makefile)