aclocal.m4

dnl aclocal.m4 generated automatically by aclocal 1.4a

dnl Copyright (C) 1994, 1995-9, 2000 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

dnl This program is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY, to the extent permitted by law; without
dnl even the implied warranty of MERCHANTABILITY or FITNESS FOR A
dnl PARTICULAR PURPOSE.

dnl grub_ASM_USCORE checks if C symbols get an underscore after
dnl compiling to assembler.
dnl Written by Pavel Roskin. Based on grub_ASM_EXT_C written by
dnl Erich Boleyn and modified by OKUJI Yoshinori
AC_DEFUN(grub_ASM_USCORE,
[AC_REQUIRE([AC_PROG_CC])
AC_MSG_CHECKING([if C symbols get an underscore after compilation])
AC_CACHE_VAL(grub_cv_asm_uscore,
[cat > conftest.c <<\EOF
int
func (int *list)
{
  *list = 0;
  return *list;
}
EOF

if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -S conftest.c]) && test -s conftest.s; then
  true
else
  AC_MSG_ERROR([${CC-cc} failed to produce assembly code])
fi

if grep _func conftest.s >/dev/null 2>&1; then
  grub_cv_asm_uscore=yes
else
  grub_cv_asm_uscore=no
fi

rm -f conftest*])

if test "x$grub_cv_asm_uscore" = xyes; then
  AC_DEFINE_UNQUOTED([HAVE_ASM_USCORE], $grub_cv_asm_uscore,
    [Define if C symbols get an underscore after compilation])
fi

AC_MSG_RESULT([$grub_cv_asm_uscore])
])


dnl Some versions of `objcopy -O binary' vary their output depending
dnl on the link address.
AC_DEFUN(grub_PROG_OBJCOPY_ABSOLUTE,
[AC_MSG_CHECKING([whether ${OBJCOPY} works for absolute addresses])
AC_CACHE_VAL(grub_cv_prog_objcopy_absolute,
[cat > conftest.c <<\EOF
void
cmain (void)
{
   *((int *) 0x1000) = 2;
}
EOF

if AC_TRY_EVAL(ac_compile) && test -s conftest.o; then :
else
  AC_MSG_ERROR([${CC-cc} cannot compile C source code])
fi
grub_cv_prog_objcopy_absolute=yes
for link_addr in 2000 8000 7C00; do
  if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -nostdlib -Wl,-N -Wl,-Ttext -Wl,$link_addr conftest.o -o conftest.exec]); then :
  else
    AC_MSG_ERROR([${CC-cc} cannot link at address $link_addr])
  fi
  if AC_TRY_COMMAND([${OBJCOPY-objcopy} -O binary conftest.exec conftest]); then :
  else
    AC_MSG_ERROR([${OBJCOPY-objcopy} cannot create binary files])
  fi
  if test ! -f conftest.old || AC_TRY_COMMAND([cmp -s conftest.old conftest]); then
    mv -f conftest conftest.old
  else
    grub_cv_prog_objcopy_absolute=no
    break
  fi
done
rm -f conftest*])
AC_MSG_RESULT([$grub_cv_prog_objcopy_absolute])])

dnl Mass confusion!
dnl Older versions of GAS interpret `.code16' to mean ``generate 32-bit
dnl instructions, but implicitly insert addr32 and data32 bytes so
dnl that the code works in real mode''.
dnl
dnl Newer versions of GAS interpret `.code16' to mean ``generate 16-bit
dnl instructions,'' which seems right.  This requires the programmer
dnl to explicitly insert addr32 and data32 instructions when they want
dnl them.
dnl
dnl We only support the newer versions, because the old versions cause
dnl major pain, by requiring manual assembly to get 16-bit instructions into
dnl stage1/stage1.S.
AC_DEFUN(grub_ASM_ADDR32,
[AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([grub_ASM_PREFIX_REQUIREMENT])
AC_MSG_CHECKING([for .code16 addr32 assembler support])
AC_CACHE_VAL(grub_cv_asm_addr32,
[cat > conftest.s.in <<\EOF
	.code16
l1:	@ADDR32@	movb	%al, l1
EOF

if test "x$grub_cv_asm_prefix_requirement" = xyes; then
  sed -e s/@ADDR32@/addr32/ < conftest.s.in > conftest.s
else
  sed -e s/@ADDR32@/addr32\;/ < conftest.s.in > conftest.s
fi

if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -c conftest.s]) && test -s conftest.o; then
  grub_cv_asm_addr32=yes
else
  grub_cv_asm_addr32=no
fi

rm -f conftest*])

AC_MSG_RESULT([$grub_cv_asm_addr32])])

dnl
dnl Later versions of GAS requires that addr32 and data32 prefixes
dnl appear in the same lines as the instructions they modify, while
dnl earlier versions requires that they appear in separate lines.
AC_DEFUN(grub_ASM_PREFIX_REQUIREMENT,
[AC_REQUIRE([AC_PROG_CC])
AC_MSG_CHECKING(dnl
[whether addr32 must be in the same line as the instruction])
AC_CACHE_VAL(grub_cv_asm_prefix_requirement,
[cat > conftest.s <<\EOF
	.code16
l1:	addr32	movb	%al, l1
EOF

if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -c conftest.s]) && test -s conftest.o; then
  grub_cv_asm_prefix_requirement=yes
else
  grub_cv_asm_prefix_requirement=no
fi

rm -f conftest*])

if test "x$grub_cv_asm_prefix_requirement" = xyes; then
  grub_tmp_addr32="addr32"
  grub_tmp_data32="data32"
else
  grub_tmp_addr32="addr32;"
  grub_tmp_data32="data32;"
fi

AC_DEFINE_UNQUOTED([ADDR32], $grub_tmp_addr32,
  [Define it to \"addr32\" or \"addr32;\" to make GAS happy])
AC_DEFINE_UNQUOTED([DATA32], $grub_tmp_data32,
  [Define it to \"data32\" or \"data32;\" to make GAS happy])

AC_MSG_RESULT([$grub_cv_asm_prefix_requirement])])

dnl
dnl grub_CHECK_START_SYMBOL checks if start is automatically defined by
dnl the compiler.
dnl Written by OKUJI Yoshinori
AC_DEFUN(grub_CHECK_START_SYMBOL,
[AC_REQUIRE([AC_PROG_CC])
AC_MSG_CHECKING([if start is defined by the compiler])
AC_CACHE_VAL(grub_cv_check_start_symbol,
[AC_TRY_LINK([], [asm ("incl start")],
   grub_cv_check_start_symbol=yes,
   grub_cv_check_start_symbol=no)])

if test "x$grub_cv_check_start_symbol" = xyes; then
  AC_DEFINE([HAVE_START_SYMBOL])
fi

AC_MSG_RESULT([$grub_cv_check_start_symbol])
])

dnl
dnl grub_CHECK_USCORE_START_SYMBOL checks if _start is automatically
dnl defined by the compiler.
dnl Written by OKUJI Yoshinori
AC_DEFUN(grub_CHECK_USCORE_START_SYMBOL,
[AC_REQUIRE([AC_PROG_CC])
AC_MSG_CHECKING([if _start is defined by the compiler])
AC_CACHE_VAL(grub_cv_check_uscore_start_symbol,
[AC_TRY_LINK([], [asm ("incl _start")],
   grub_cv_check_uscore_start_symbol=yes,
   grub_cv_check_uscore_start_symbol=no)])

if test "x$grub_cv_check_uscore_start_symbol" = xyes; then
  AC_DEFINE([HAVE_USCORE_START_SYMBOL])
fi

AC_MSG_RESULT([$grub_cv_check_uscore_start_symbol])
])

dnl
dnl grub_CHECK_USCORE_USCORE_BSS_START_SYMBOL checks if __bss_start is
dnl automatically defined by the compiler.
dnl Written by Michael Hohmoth.
AC_DEFUN(grub_CHECK_USCORE_USCORE_BSS_START_SYMBOL,
[AC_REQUIRE([AC_PROG_CC])
AC_MSG_CHECKING([if __bss_start is defined by the compiler])
AC_CACHE_VAL(grub_cv_check_uscore_uscore_bss_start_symbol,
[AC_TRY_LINK([], [asm ("incl __bss_start")],
   grub_cv_check_uscore_uscore_bss_start_symbol=yes,
   grub_cv_check_uscore_uscore_bss_start_symbol=no)])

if test "x$grub_cv_check_uscore_uscore_bss_start_symbol" = xyes; then
  AC_DEFINE([HAVE_USCORE_USCORE_BSS_START_SYMBOL])
fi

AC_MSG_RESULT([$grub_cv_check_uscore_uscore_bss_start_symbol])
])

dnl
dnl grub_CHECK_EDATA_SYMBOL checks if edata is automatically defined by the
dnl compiler.
dnl Written by Michael Hohmuth.
AC_DEFUN(grub_CHECK_EDATA_SYMBOL,
[AC_REQUIRE([AC_PROG_CC])
AC_MSG_CHECKING([if edata is defined by the compiler])
AC_CACHE_VAL(grub_cv_check_edata_symbol,
[AC_TRY_LINK([], [asm ("incl edata")],
   grub_cv_check_edata_symbol=yes,
   grub_cv_check_edata_symbol=no)])

if test "x$grub_cv_check_edata_symbol" = xyes; then
  AC_DEFINE([HAVE_EDATA_SYMBOL])
fi

AC_MSG_RESULT([$grub_cv_check_edata_symbol])
])

dnl
dnl grub_CHECK_USCORE_EDATA_SYMBOL checks if _edata is automatically
dnl defined by the compiler.
dnl Written by Michael Hohmuth.
AC_DEFUN(grub_CHECK_USCORE_EDATA_SYMBOL,
[AC_REQUIRE([AC_PROG_CC])
AC_MSG_CHECKING([if _edata is defined by the compiler])
AC_CACHE_VAL(grub_cv_check_uscore_edata_symbol,
[AC_TRY_LINK([], [asm ("incl _edata")],
   grub_cv_check_uscore_edata_symbol=yes,
   grub_cv_check_uscore_edata_symbol=no)])

if test "x$grub_cv_check_uscore_edata_symbol" = xyes; then
  AC_DEFINE([HAVE_USCORE_EDATA_SYMBOL])
fi

AC_MSG_RESULT([$grub_cv_check_uscore_edata_symbol])
])

dnl
dnl grub_CHECK_END_SYMBOL checks if end is automatically defined by the
dnl compiler.
dnl Written by OKUJI Yoshinori
AC_DEFUN(grub_CHECK_END_SYMBOL,
[AC_REQUIRE([AC_PROG_CC])
AC_MSG_CHECKING([if end is defined by the compiler])
AC_CACHE_VAL(grub_cv_check_end_symbol,
[AC_TRY_LINK([], [asm ("incl end")],
   grub_cv_check_end_symbol=yes,
   grub_cv_check_end_symbol=no)])

if test "x$grub_cv_check_end_symbol" = xyes; then
  AC_DEFINE([HAVE_END_SYMBOL])
fi

AC_MSG_RESULT([$grub_cv_check_end_symbol])
])

dnl
dnl grub_CHECK_USCORE_END_SYMBOL checks if _end is automatically defined
dnl by the compiler.
dnl Written by OKUJI Yoshinori
AC_DEFUN(grub_CHECK_USCORE_END_SYMBOL,
[AC_REQUIRE([AC_PROG_CC])
AC_MSG_CHECKING([if _end is defined by the compiler])
AC_CACHE_VAL(grub_cv_check_uscore_end_symbol,
[AC_TRY_LINK([], [asm ("incl _end")],
   grub_cv_check_uscore_end_symbol=yes,
   grub_cv_check_uscore_end_symbol=no)])

if test "x$grub_cv_check_uscore_end_symbol" = xyes; then
  AC_DEFINE([HAVE_USCORE_END_SYMBOL])
fi

AC_MSG_RESULT([$grub_cv_check_uscore_end_symbol])
])

# Do all the work for Automake.  This macro actually does too much --
# some checks are only needed if your package does certain things.
# But this isn't really a big deal.

# serial 1

dnl Usage:
dnl AM_INIT_AUTOMAKE(package,version, [no-define])

AC_DEFUN(AM_INIT_AUTOMAKE,
[AC_REQUIRE([AC_PROG_INSTALL])
dnl We require 2.13 because we rely on SHELL being computed by configure.
AC_PREREQ([2.13])
PACKAGE=[$1]
AC_SUBST(PACKAGE)
VERSION=[$2]
AC_SUBST(VERSION)
dnl test to see if srcdir already configured
if test "`CDPATH=: && cd $srcdir && pwd`" != "`pwd`" &&
   test -f $srcdir/config.status; then
  AC_MSG_ERROR([source directory already configured; run "make distclean" there first])
fi
ifelse([$3],,
AC_DEFINE_UNQUOTED(PACKAGE, "$PACKAGE", [Name of package])
AC_DEFINE_UNQUOTED(VERSION, "$VERSION", [Version number of package]))
AC_REQUIRE([AM_SANITY_CHECK])
AC_REQUIRE([AC_ARG_PROGRAM])
AM_MISSING_PROG(ACLOCAL, aclocal)
AM_MISSING_PROG(AUTOCONF, autoconf)
AM_MISSING_PROG(AUTOMAKE, automake)
AM_MISSING_PROG(AUTOHEADER, autoheader)
AM_MISSING_PROG(MAKEINFO, makeinfo)
AM_MISSING_PROG(AMTAR, tar)
AM_MISSING_INSTALL_SH
dnl We need awk for the "check" target.  The system "awk" is bad on
dnl some platforms.
AC_REQUIRE([AC_PROG_AWK])
AC_REQUIRE([AC_PROG_MAKE_SET])
AC_REQUIRE([AM_DEP_TRACK])
AC_REQUIRE([AM_SET_DEPDIR])
ifdef([AC_PROVIDE_AC_PROG_CC], [AM_DEPENDENCIES(CC)], [
   define([AC_PROG_CC], defn([AC_PROG_CC])[AM_DEPENDENCIES(CC)])])
ifdef([AC_PROVIDE_AC_PROG_CXX], [AM_DEPENDENCIES(CXX)], [
   define([AC_PROG_CXX], defn([AC_PROG_CXX])[AM_DEPENDENCIES(CXX)])])
])

#
# Check to make sure that the build environment is sane.
#

AC_DEFUN(AM_SANITY_CHECK,
[AC_MSG_CHECKING([whether build environment is sane])
# Just in case
sleep 1
echo timestamp > conftestfile
# Do `set' in a subshell so we don't clobber the current shell's
# arguments.  Must try -L first in case configure is actually a
# symlink; some systems play weird games with the mod time of symlinks
# (eg FreeBSD returns the mod time of the symlink's containing
# directory).
if (
   set X `ls -Lt $srcdir/configure conftestfile 2> /dev/null`
   if test "[$]*" = "X"; then
      # -L didn't work.
      set X `ls -t $srcdir/configure conftestfile`
   fi
   if test "[$]*" != "X $srcdir/configure conftestfile" \
      && test "[$]*" != "X conftestfile $srcdir/configure"; then

      # If neither matched, then we have a broken ls.  This can happen
      # if, for instance, CONFIG_SHELL is bash and it inherits a
      # broken ls alias from the environment.  This has actually
      # happened.  Such a system could not be considered "sane".
      AC_MSG_ERROR([ls -t appears to fail.  Make sure there is not a broken
alias in your environment])
   fi

   test "[$]2" = conftestfile
   )
then
   # Ok.
   :
else
   AC_MSG_ERROR([newly created file is older than distributed files!
Check your system clock])
fi
rm -f conftest*
AC_MSG_RESULT(yes)])

dnl AM_MISSING_PROG(NAME, PROGRAM)
AC_DEFUN(AM_MISSING_PROG, [
AC_REQUIRE([AM_MISSING_HAS_RUN])
$1=${$1-"${am_missing_run}$2"}
AC_SUBST($1)])

dnl Like AM_MISSING_PROG, but only looks for install-sh.
dnl AM_MISSING_INSTALL_SH()
AC_DEFUN(AM_MISSING_INSTALL_SH, [
AC_REQUIRE([AM_MISSING_HAS_RUN])
if test -z "$install_sh"; then
   install_sh="$ac_aux_dir/install-sh"
   test -f "$install_sh" || install_sh="$ac_aux_dir/install.sh"
   test -f "$install_sh" || install_sh="${am_missing_run}${ac_auxdir}/install-sh"
   dnl FIXME: an evil hack: we remove the SHELL invocation from
   dnl install_sh because automake adds it back in.  Sigh.
   install_sh="`echo $install_sh | sed -e 's/\${SHELL}//'`"
fi
AC_SUBST(install_sh)])

dnl AM_MISSING_HAS_RUN.
dnl Define MISSING if not defined so far and test if it supports --run.
dnl If it does, set am_missing_run to use it, otherwise, to nothing.
AC_DEFUN([AM_MISSING_HAS_RUN], [
test x"${MISSING+set}" = xset || \
  MISSING="\${SHELL} `CDPATH=: && cd $ac_aux_dir && pwd`/missing"
dnl Use eval to expand $SHELL
if eval "$MISSING --run :"; then
  am_missing_run="$MISSING --run "
else
  am_missing_run=
  am_backtick='`'
  AC_MSG_WARN([${am_backtick}missing' script is too old or missing])
fi
])

dnl See how the compiler implements dependency checking.
dnl Usage:
dnl AM_DEPENDENCIES(NAME)
dnl NAME is "CC", "CXX" or "OBJC".

dnl We try a few techniques and use that to set a single cache variable.

AC_DEFUN(AM_DEPENDENCIES,[
AC_REQUIRE([AM_SET_DEPDIR])
AC_REQUIRE([AM_OUTPUT_DEPENDENCY_COMMANDS])
ifelse([$1],CC,[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_PROG_CPP])
depcc="$CC"
depcpp="$CPP"],[$1],CXX,[
AC_REQUIRE([AC_PROG_CXX])
AC_REQUIRE([AC_PROG_CXXCPP])
depcc="$CXX"
depcpp="$CXXCPP"],[$1],OBJC,[
am_cv_OBJC_dependencies_compiler_type=gcc],[
AC_REQUIRE([AC_PROG_][$1])
depcc="$[$1]"
depcpp=""])
AC_MSG_CHECKING([dependency style of $depcc])
AC_CACHE_VAL(am_cv_[$1]_dependencies_compiler_type,[
if test -z "$AMDEP"; then
  echo '#include "conftest.h"' > conftest.c
  echo 'int i;' > conftest.h

  am_cv_[$1]_dependencies_compiler_type=none
  for depmode in `sed -n 's/^#*\([a-zA-Z0-9]*\))$/\1/p' < "$am_depcomp"`; do
    case "$depmode" in
    nosideeffect)
      # after this tag, mechanisms are not by side-effect, so they'll
      # only be used when explicitly requested
      if test "x$enable_dependency_tracking" = xyes; then
	continue
      else
	break
      fi
      ;;
    none) break ;;
    esac
    if depmode="$depmode" \
       source=conftest.c object=conftest.o \
       depfile=conftest.Po tmpdepfile=conftest.TPo \
       $SHELL $am_depcomp $depcc -c conftest.c 2>/dev/null &&
       grep conftest.h conftest.Po > /dev/null 2>&1; then
      am_cv_[$1]_dependencies_compiler_type="$depmode"
      break
    fi
  done

  rm -f conftest.*
else
  am_cv_[$1]_dependencies_compiler_type=none
fi
])
AC_MSG_RESULT($am_cv_[$1]_dependencies_compiler_type)
[$1]DEPMODE="depmode=$am_cv_[$1]_dependencies_compiler_type"
AC_SUBST([$1]DEPMODE)
])

dnl Choose a directory name for dependency files.
dnl This macro is AC_REQUIREd in AM_DEPENDENCIES

AC_DEFUN(AM_SET_DEPDIR,[
if test -d .deps || mkdir .deps 2> /dev/null || test -d .deps; then
  DEPDIR=.deps
else
  DEPDIR=_deps
fi
AC_SUBST(DEPDIR)
])

AC_DEFUN(AM_DEP_TRACK,[
AC_ARG_ENABLE(dependency-tracking,
[  --disable-dependency-tracking Speeds up one-time builds
  --enable-dependency-tracking  Do not reject slow dependency extractors])
if test "x$enable_dependency_tracking" = xno; then
  AMDEP="#"
else
  am_depcomp="$ac_aux_dir/depcomp"
  if test ! -f "$am_depcomp"; then
    AMDEP="#"
  else
    AMDEP=
  fi
fi
AC_SUBST(AMDEP)
if test -z "$AMDEP"; then
  AMDEPBACKSLASH='\'
else
  AMDEPBACKSLASH=
fi
pushdef([subst], defn([AC_SUBST]))
subst(AMDEPBACKSLASH)
popdef([subst])
])

dnl Generate code to set up dependency tracking.
dnl This macro should only be invoked once -- use via AC_REQUIRE.
dnl Usage:
dnl AM_OUTPUT_DEPENDENCY_COMMANDS

dnl
dnl This code is only required when automatic dependency tracking
dnl is enabled.  FIXME.  This creates each `.P' file that we will
dnl need in order to bootstrap the dependency handling code.
AC_DEFUN(AM_OUTPUT_DEPENDENCY_COMMANDS,[
AC_OUTPUT_COMMANDS([
test x"$AMDEP" != x"" ||
for mf in $CONFIG_FILES; do
  case "$mf" in
  Makefile) dirpart=.;;
  */Makefile) dirpart=`echo "$mf" | sed -e 's|/[^/]*$||'`;;
  *) continue;;
  esac
  grep '^DEP_FILES *= *[^ #]' < "$mf" > /dev/null || continue
  # Extract the definition of DEP_FILES from the Makefile without
  # running `make'.
  DEPDIR=`sed -n -e '/^DEPDIR = / s///p' < "$mf"`
  test -z "$DEPDIR" && continue
  # When using ansi2knr, U may be empty or an underscore; expand it
  U=`sed -n -e '/^U = / s///p' < "$mf"`
  test -d "$dirpart/$DEPDIR" || mkdir "$dirpart/$DEPDIR"
  # We invoke sed twice because it is the simplest approach to
  # changing $(DEPDIR) to its actual value in the expansion.
  for file in `sed -n -e '
    /^DEP_FILES = .*\\\\$/ {
      s/^DEP_FILES = //
      :loop
	s/\\\\$//
	p
	n
	/\\\\$/ b loop
      p
    }
    /^DEP_FILES = / s/^DEP_FILES = //p' < "$mf" | \
       sed -e 's/\$(DEPDIR)/'"$DEPDIR"'/g' -e 's/\$U/'"$U"'/g'`; do
    # Make sure the directory exists.
    test -f "$dirpart/$file" && continue
    fdir=`echo "$file" | sed -e 's|/[^/]*$||'`
    $ac_aux_dir/mkinstalldirs "$dirpart/$fdir" > /dev/null 2>&1
    # echo "creating $dirpart/$file"
    echo '# dummy' > "$dirpart/$file"
  done
done
], [AMDEP="$AMDEP"
ac_aux_dir="$ac_aux_dir"])])

# Like AC_CONFIG_HEADER, but automatically create stamp file.

AC_DEFUN(AM_CONFIG_HEADER,
[AC_PREREQ([2.12])
AC_CONFIG_HEADER([$1])
dnl When config.status generates a header, we must update the stamp-h file.
dnl This file resides in the same directory as the config header
dnl that is generated.  We must strip everything past the first ":",
dnl and everything past the last "/".
AC_OUTPUT_COMMANDS(changequote(<<,>>)dnl
ifelse(patsubst(<<$1>>, <<[^ ]>>, <<>>), <<>>,
<<test -z "<<$>>CONFIG_HEADERS" || echo timestamp > patsubst(<<$1>>, <<^\([^:]*/\)?.*>>, <<\1>>)stamp-h<<>>dnl>>,
<<am_indx=1
for am_file in <<$1>>; do
  case " <<$>>CONFIG_HEADERS " in
  *" <<$>>am_file "*<<)>>
    echo timestamp > `echo <<$>>am_file | sed -e 's%:.*%%' -e 's%[^/]*$%%'`stamp-h$am_indx
    ;;
  esac
  am_indx=`expr "<<$>>am_indx" + 1`
done<<>>dnl>>)
changequote([,]))])

# Add --enable-maintainer-mode option to configure.
# From Jim Meyering

# serial 1

AC_DEFUN(AM_MAINTAINER_MODE,
[AC_MSG_CHECKING([whether to enable maintainer-specific portions of Makefiles])
  dnl maintainer-mode is disabled by default
  AC_ARG_ENABLE(maintainer-mode,
[  --enable-maintainer-mode enable make rules and dependencies not useful
                          (and sometimes confusing) to the casual installer],
      USE_MAINTAINER_MODE=$enableval,
      USE_MAINTAINER_MODE=no)
  AC_MSG_RESULT($USE_MAINTAINER_MODE)
  AM_CONDITIONAL(MAINTAINER_MODE, test $USE_MAINTAINER_MODE = yes)
  MAINT=$MAINTAINER_MODE_TRUE
  AC_SUBST(MAINT)dnl
]
)

# Define a conditional.

AC_DEFUN(AM_CONDITIONAL,
[AC_SUBST($1_TRUE)
AC_SUBST($1_FALSE)
if $2; then
  $1_TRUE=
  $1_FALSE='#'
else
  $1_TRUE='#'
  $1_FALSE=
fi])