overhaul configure.in: use octathorps for comments so they're passed through m4 proce...

diff --cc configure.in
index 6d1f64b3cb15b9267841941512060c4de00452a8,2a684b2c6d0546440030e8b46d5e9394c3893f16..27e29547acf31c41e18fb33db40a1bd51d01b56f
--- 1/configure.in
--- 2/configure.in
+++ b/configure.in
@@@ -1,39 -1,39 +1,40 @@@
--dnl Process this file with autoconf to produce a configure script.
++#                                               -*- Autoconf -*-
++# Process this file with autoconf to produce a configure script.
  
--dnl This file is part of flex.
++# This file is part of flex.
  
--dnl Redistribution and use in source and binary forms, with or without
--dnl modification, are permitted provided that the following conditions
--dnl are met:
++# Redistribution and use in source and binary forms, with or without
++# modification, are permitted provided that the following conditions
++# are met:
  
--dnl 1. Redistributions of source code must retain the above copyright
--dnl notice, this list of conditions and the following disclaimer.
--dnl 2. Redistributions in binary form must reproduce the above copyright
--dnl notice, this list of conditions and the following disclaimer in the
--dnl documentation and/or other materials provided with the distribution.
++# 1. Redistributions of source code must retain the above copyright
++# notice, this list of conditions and the following disclaimer.
++# 2. Redistributions in binary form must reproduce the above copyright
++# notice, this list of conditions and the following disclaimer in the
++# documentation and/or other materials provided with the distribution.
  
--dnl Neither the name of the University nor the names of its contributors
--dnl may be used to endorse or promote products derived from this software
--dnl without specific prior written permission.
++# Neither the name of the University nor the names of its contributors
++# may be used to endorse or promote products derived from this software
++# without specific prior written permission.
  
--dnl THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
--dnl IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
--dnl WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
--dnl PURPOSE.
++# THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
++# IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
++# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
++# PURPOSE.
  
--dnl autoconf requirements and initialization
++# autoconf requirements and initialization
  
--AC_PREREQ(2.54)
 -AC_INIT(flex,2.5.29,lex-help@lists.sourceforge.net)
 -AC_CONFIG_SRCDIR(scan.l)
 -AM_INIT_AUTOMAKE
 -AC_CONFIG_HEADER(config.h:conf.in)
 -AM_MAINTAINER_MODE
++AC_PREREQ(2.59)
 +AC_INIT([the fast lexical analyser generator], [2.5.33],
 +[flex-help@lists.sourceforge.net], [flex])
- AC_CONFIG_SRCDIR(scan.l)
- AM_INIT_AUTOMAKE(gnits dist-bzip2)
- AC_CONFIG_HEADER(config.h:conf.in)
++AC_CONFIG_SRCDIR([scan.l])
++AM_INIT_AUTOMAKE([gnits dist-bzip2])
++AC_CONFIG_HEADER([config.h:conf.in])
  
--dnl checks for programs
++# checks for programs
  
  AM_GNU_GETTEXT([external])
 -AM_GNU_GETTEXT_VERSION(0.11.5)
 +AM_GNU_GETTEXT_VERSION(0.12)
  
  AC_PROG_YACC
  AM_PROG_LEX
@@@ -41,30 -41,15 +42,34 @@@ AC_PROG_C
  AC_PROG_CXX
  AC_PROG_LN_S
  AC_PROG_RANLIB
++AC_PROG_AWK
++AC_PROG_INSTALL
  
  AC_PATH_PROG(BISON, bison,bison)
  AC_PATH_PROG(HELP2MAN, help2man, help2man)
 -AC_PATH_PROGS(M4, gnum4 gm4 m4, m4)
 +
- 
 +# Check for a GNU m4 that supports --prefix-builtins
++
 +AC_PATH_PROGS(M4, gm4 gnum4 m4, m4)
++
 +if test x"$M4" != x; then
 +  AC_MSG_CHECKING([for GNU m4])
 +  case `$M4 --help < /dev/null 2>&1` in
 +    *prefix-builtins*) AC_MSG_RESULT(yes) ;;
 +    *) AC_MSG_RESULT(no) ;
 +       AC_MSG_ERROR([GNU M4 1.4 is required]) ;;
 +  esac
 +else
 +   AC_MSG_ERROR([GNU M4 1.4 is required]) ;
 +fi
++
 +AC_DEFINE_UNQUOTED([M4], ["$M4"], [Define to the GNU M4 executable name.])
 +
  AC_PATH_PROG(INDENT, indent, indent)
--dnl if INDENT is set to 'indent' then we didn't find indent
++# if INDENT is set to 'indent' then we didn't find indent
  if test "$INDENT" != indent ; then
     AC_MSG_CHECKING(if $INDENT is GNU indent)
 -   if $INDENT --version 2>/dev/null | head -1|grep "GNU indent" > /dev/null ; then
 +   if $INDENT --version 2>/dev/null | head -n 1|grep "GNU indent" > /dev/null ; then
        AC_MSG_RESULT(yes)
     else
        AC_MSG_RESULT(no)
@@@ -74,28 -59,25 +79,28 @@@ els
     AC_MSG_WARN(no indent program found: make indent target will not function)
  fi
  
--dnl checks for libraries
--AC_CHECK_LIB(m, log)
--
--dnl checks for header files
++# checks for libraries
  
++AC_FUNC_ALLOCA
  AC_HEADER_STDC
- AC_CHECK_HEADERS(unistd.h stdbool.h  netinet/in.h limits.h)
- AC_CHECK_HEADERS( sys/wait.h sys/params.h)
 -AC_CHECK_HEADERS(unistd.h stdbool.h  netinet/in.h limits.h sys/params.h)
--AC_CHECK_HEADERS(cunistd)
- AC_CHECK_HEADERS(locale.h libintl.h)
- AC_CHECK_HEADERS(regex.h)
- AC_CHECK_HEADERS(assert.h)
++AC_HEADER_SYS_WAIT
++AC_CHECK_HEADERS([inttypes.h libintl.h limits.h locale.h malloc.h netinet/in.h stddef.h stdlib.h string.h strings.h unistd.h])
++AC_CHECK_LIB(m, log10)
  
--dnl checks for types
++# Checks for typedefs, structures, and compiler characteristics.
  
++AC_HEADER_STDBOOL
++AC_C_CONST
  AC_TYPE_SIZE_T
  
--dnl checks for functions
++# Checks for library functions.
  
--AC_CHECK_DECLS(__func__)
++AC_FUNC_FORK
++AC_FUNC_MALLOC
++AC_FUNC_REALLOC
++AC_CHECK_FUNCS([dup2 isascii memset pow regcomp setlocale strchr strtol])
  
  AC_CONFIG_FILES(
 -flex.spec
  Makefile
  doc/Makefile
  examples/Makefile