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configure.inc

#   @(#) configure.inc 1.38@(#)
#   Copyright (c) 1999-2004 David Parsons. All rights reserved.
#   
#   Redistribution and use in source and binary forms, with or without
#   modification, are permitted provided that the following conditions
#   are met:
#  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.
#  3. My name may not be used to endorse or promote products derived
#     from this software without specific prior written permission.
#     
#  THIS SOFTWARE IS PROVIDED BY DAVID PARSONS ``AS IS'' AND ANY
#  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
#  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
#  PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID
#  PARSONS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
#  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
#  TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
#  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
#  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
#  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
#  IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
#  THE POSSIBILITY OF SUCH DAMAGE.
#


#
# this preamble code is executed when this file is sourced and it picks
# interesting things off the command line.
#
ac_default_path="/sbin:/usr/sbin:/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin"

ac_standard="--src=DIR        where the source lives (.)
--prefix=DIR            where to install the final product (/usr/local)
--execdir=DIR           where to put executables (prefix/bin)
--sbindir=DIR           where to put static executables (prefix/sbin)
--confdir=DIR           where to put configuration information (/etc)
--libdir=DIR            where to put libraries (prefix/lib)
--libexecdir=DIR  where to put private executables
--mandir=DIR            where to put manpages"

__fail=exit

if dirname B/A 2>/dev/null >/dev/null; then
__ac_dirname() {
    dirname "$1"
}
else
__ac_dirname() {
    echo "$1" | sed -e 's:/[^/]*$::'
}
fi

ac_progname=$0
ac_configure_command=
Q=\'
for x in "$@"; do
    ac_configure_command="$ac_configure_command $Q$x$Q"
done
# ac_configure_command="$*"

__d=`__ac_dirname "$ac_progname"`
if [ "$__d" = "$ac_progname" ]; then
    AC_SRCDIR=`pwd`
else
    AC_SRCDIR=`cd $__d;pwd`
fi

__ac_dir() {
    if test -d "$1"; then
      (cd "$1";pwd)
    else
      echo "$1";
    fi
}

while [ $# -gt 0 ]; do
    unset matched

    case X"$1" in
    X--src|X--srcdir)
      AC_SRCDIR=`__ac_dir "$2"`
      _set_srcdir=1
      shift 2;;

    X--src=*|X--srcdir=*)
      __d=`echo "$1" | sed -e 's/^[^=]*=//'`
      AC_SRCDIR=`__ac_dir "$__d"`
      _set_srcdir=1
      shift 1 ;;

    X--prefix)
      AC_PREFIX=`__ac_dir "$2"`
      _set_prefix=1
      shift 2;;

    X--prefix=*)
      __d=`echo "$1"| sed -e 's/^[^=]*=//'`
      AC_PREFIX=`__ac_dir "$__d"`
      _set_prefix=1
      shift 1;;

    X--confdir)
      AC_CONFDIR=`__ac_dir "$2"`
      _set_confdir=1
      shift 2;;

    X--confdir=*)
      __d=`echo "$1" | sed -e 's/^[^=]*=//'`
      AC_CONFDIR=`__ac_dir "$__d"`
      _set_confdir=1
      shift 1;;

    X--libexec|X--libexecdir)
      AC_LIBEXEC=`__ac_dir "$2"`
      _set_libexec=1
      shift 2;;

    X--libexec=*|X--libexecdir=*)
      __d=`echo "$1" | sed -e 's/^[^=]*=//'`
      AC_LIBEXEC=`__ac_dir "$__d"`
      _set_libexec=1
      shift 1;;

    X--lib|X--libdir)
      AC_LIBDIR=`__ac_dir "$2"`
      _set_libdir=1
      shift 2;;

    X--lib=*|X--libdir=*)
      __d=`echo "$1" | sed -e 's/^[^=]*=//'`
      AC_LIBDIR=`__ac_dir "$__d"`
      _set_libdir=1
      shift 1;;

    X--exec|X--execdir)
      AC_EXECDIR=`__ac_dir "$2"`
      _set_execdir=1
      shift 2;;

    X--exec=*|X--execdir=*)
      __d=`echo "$1" | sed -e 's/^[^=]*=//'`
      AC_EXECDIR=`__ac_dir "$__d"`
      _set_execdir=1
      shift 1;;

    X--sbin|X--sbindir)
      AC_SBINDIR=`__ac_dir "$2"`
      _set_sbindir=1
      shift 2;;

    X--sbin=*|X--sbindir=*)
      __d=`echo "$1" | sed -e 's/^[^=]*=//'`
      AC_SBINDIR=`__ac_dir "$__d"`
      _set_sbindir=1
      shift 1;;

    X--man|X--mandir)
      AC_MANDIR=`__ac_dir "$2"`
      _set_mandir=1
      shift 2;;

    X--man=*|X--mandir=*)
      __d=`echo "$1" | sed -e 's/^[^=]*=//'`
      AC_MANDIR=`__ac_dir "$__d"`
      _set_mandir=1
      shift 1;;

    X--use-*=*)
      _var=`echo "$1"| sed -n 's/^--use-\([A-Za-z][-A-Za-z0-9_]*\)=.*$/\1/p'`
      if [ "$_var" ]; then
          _val=`echo "$1" | sed -e 's/^--use-[^=]*=\(.*\)$/\1/'`
          _v=`echo $_var | tr '[a-z]' '[A-Z]' | tr '-' '_'`
          case X"$_val" in
          X[Yy][Ee][Ss]|X[Tt][Rr][Uu][Ee]) eval USE_${_v}=T ;;
          X[Nn][Oo]|X[Ff][Aa][Ll][Ss][Ee]) eval unset USE_${_v} ;;
          *) echo "Bad value for --use-$_var ; must be yes or no"
             exit 1 ;;
          esac
      else
          echo "Bad option $1.   Use --help to show options" 1>&2
          exit 1
      fi
      shift 1 ;;

    X--use-*)
        _var=`echo "$1"|sed -n 's/^--use-\([A-Za-z][-A-Za-z0-9_]*\)$/\1/p'`
      _v=`echo $_var | tr '[a-z]' '[A-Z]' | tr '-' '_'`
      eval USE_${_v}=T
      shift 1;;

    X--with-*=*)
      _var=`echo "$1"| sed -n 's/^--with-\([A-Za-z][-A-Za-z0-9_]*\)=.*$/\1/p'`
      if [ "$_var" ]; then
          _val=`echo "$1" | sed -e 's/^--with-[^=]*=\(.*\)$/\1/'`
          _v=`echo $_var | tr '[a-z]' '[A-Z]' | tr '-' '_'`
          eval WITH_${_v}=\"$_val\"
      else
          echo "Bad option $1.   Use --help to show options" 1>&2
          exit 1
      fi
      shift 1 ;;

    X--with-*)
      _var=`echo "$1" | sed -n 's/^--with-\([A-Za-z][A-Za-z0-9_-]*\)$/\1/p'`
      if [ "$_var" ]; then
          _v=`echo $_var | tr '[a-z]' '[A-Z]' | tr '-' '_'`
          eval WITH_${_v}=1
      else
          echo "Bad option $1.   Use --help to show options" 1>&2
          exit 1
      fi
      shift 1 ;;

    X--help)
      echo "$ac_standard"
      test "$ac_help" && echo "$ac_help"
      exit 0;;

    *)      if [ "$LOCAL_AC_OPTIONS" ]; then
          eval "$LOCAL_AC_OPTIONS"
      else
          ac_error=T
      fi
      if [ "$ac_error" ]; then
          echo "Bad option $1.   Use --help to show options" 1>&2
          exit 1
      fi ;;
    esac
done


#
# echo w/o newline
#
echononl()
{
    ${ac_echo:-echo} "${@}$ac_echo_nonl"
}

#
# log something to the terminal and to a logfile.
#
LOG () {
    echo "$@"
    echo "$@" 1>&5
}

#
# log something to the terminal without a newline, and to a logfile with
# a newline
#
LOGN () {
    echononl "$@" 1>&5
    echo "$@"
}

#
# log something to the terminal
#
TLOG () {
    echo "$@" 1>&5
}

#
# log something to the terminal, no newline
#
TLOGN () {
    echononl "$@" 1>&5
}


#
# AC_CONTINUE tells configure not to bomb if something fails, but to
# continue blithely along
#
AC_CONTINUE () {
    __fail="return"
}

#
# Emulate gnu autoconf's AC_CHECK_HEADERS() function
#
AC_CHECK_HEADERS () {
    AC_PROG_CC

    echo "/* AC_CHECK_HEADERS */" > /tmp/ngc$$.c
    for hdr in $*; do
      echo "#include <$hdr>" >> /tmp/ngc$$.c
    done
    echo "main() { }" >> /tmp/ngc$$.c

    LOGN "checking for header $hdr"

    if $AC_CC -o /tmp/ngc$$ /tmp/ngc$$.c; then
      AC_DEFINE 'HAVE_'`echo $hdr | tr 'a-z' 'A-Z' | tr './' '_'` 1
      TLOG " (found)"
      rc=0
    else
      TLOG " (not found)"
      rc=1
    fi
    rm -f /tmp/ngc$$.c /tmp/ngc$$
    return $rc
}


#
# emulate GNU autoconf's AC_CHECK_FUNCS function
#
AC_CHECK_FUNCS () {
    AC_PROG_CC

F=$1
shift
rm -f /tmp/ngc$$.c

while [ "$1" ]; do
    echo "#include <$1>" >> /tmp/ngc$$.c
    shift
done

    cat >> /tmp/ngc$$.c << EOF
main()
{
    $F();
}
EOF

    LOGN "checking for the $F function"

    if $AC_CC -o /tmp/ngc$$ /tmp/ngc$$.c $LIBS; then
      AC_DEFINE `echo ${2:-HAVE_$F} | tr 'a-z' 'A-Z'` 1
      TLOG " (found)"
      rc=0
    else
      echo "offending command was:"
      cat /tmp/ngc$$.c
      echo "$AC_CC -o /tmp/ngc$$ /tmp/ngc$$.c $LIBS"
      TLOG " (not found)"
      rc=1
    fi
    rm -f /tmp/ngc$$.c /tmp/ngc$$
    return $rc
}


#
# check to see if some structure exists
#
# usage: AC_CHECK_STRUCT structure {include ...}
#
AC_CHECK_STRUCT () {
    AC_PROG_CC
    struct=$1
    shift

    rm -f /tmp/ngc$$.c

    for include in $*; do
      echo "#include <$include>" >> /tmp/ngc$$.c
    done

    cat >> /tmp/ngc$$.c << EOF
main()
{
    struct $struct foo;
}
EOF

    LOGN "checking for struct $struct"

    if $AC_CC -o /tmp/ngc$$ /tmp/ngc$$.c $AC_LIBS 2>>config.log; then
      AC_DEFINE HAVE_STRUCT_`echo ${struct} | tr 'a-z' 'A-Z'`
      TLOG " (found)"
      rc=0
    else
      TLOG " (not found)"
      rc=1
    fi
    rm -f /tmp/ngc$$.c /tmp/ngc$$
    return $rc
}


#
# check to see if some structure contains a field
#
# usage: AC_CHECK_FIELD structure field {include ...}
#
AC_CHECK_FIELD () {
    AC_PROG_CC

    struct=$1
    field=$2
    shift 2

    rm -f /tmp/ngc$$.c

    for include in $*;do
      echo "#include <$include>" >> /tmp/ngc$$.c
    done

    cat >> /tmp/ngc$$.c << EOF
main()
{
    struct $struct foo;

    foo.$field;
}
EOF

    LOGN "checking that struct $struct has a $field field"

    if $AC_CC -o /tmp/ngc$$ /tmp/ngc$$.c $AC_LIBS 2>>config.log; then
      AC_DEFINE HAVE_`echo ${struct}_$field | tr 'a-z' 'A-Z'`
      TLOG " (yes)"
      rc=0
    else
      TLOG " (no)"
      rc=1
    fi
    rm -f /tmp/ngc$$.c /tmp/ngc$$
    return $rc
}


#
# check that the C compiler works
#
AC_PROG_CC () {
    test "$AC_CC" && return 0

    cat > /tmp/ngc$$.c << \EOF
#include <stdio.h>
main()
{
    puts("hello, sailor");
}
EOF

    TLOGN "checking the C compiler"

    unset AC_CFLAGS AC_LDFLAGS

    if [ "$CC" ] ; then
      AC_CC="$CC"
    elif [ "$WITH_PATH" ]; then
      AC_CC=`acLookFor cc`
    elif [ "`acLookFor cc`" ]; then
      # don't specify the full path if the user is looking in their $PATH
      # for a C compiler.
      AC_CC=cc
    fi

    # finally check for POSIX c89
    test "$AC_CC" || AC_CC=`acLookFor c89`

    if [ ! "$AC_CC" ]; then
      TLOG " (no C compiler found)"
      $__fail 1
    fi
    echo "checking out the C compiler"

    $AC_CC -c -o /tmp/ngc$$.o /tmp/ngc$$.c
    $AC_CC -o /tmp/ngc$$ /tmp/ngc$$.o
    status=$?

    TLOGN " ($AC_CC)"
    if [ $status -eq 0 ]; then
      TLOG " ok"

      # check that the CFLAGS and LDFLAGS aren't bogus

      unset AC_CFLAGS AC_LDFLAGS

      if [ "$CFLAGS" ]; then
          test "$CFLAGS" && echo "validating CFLAGS=${CFLAGS}"
          if $AC_CC $CFLAGS -c -o /tmp/ngc$$.o /tmp/ngc$$.c ; then
            AC_CFLAGS=${CFLAGS:-"-g"}
            test "$CFLAGS" && echo "CFLAGS=\"${CFLAGS}\" are okay"
          elif [ "$CFLAGS" ]; then
            echo "ignoring bogus CFLAGS=\"${CFLAGS}\""
          fi
      else
          AC_CFLAGS=-g
      fi
      if [ "$LDFLAGS" ]; then
          echo "validating LDFLAGS=${LDFLAGS}"
          if $AC_CC $LDFLAGS -o /tmp/ngc$$ /tmp/ngc$$.o; then
            AC_LDFLAGS="$LDFLAGS"
            TLOG "LDFLAGS=\"${AC_LDFLAGS}\" are okay"
          else
            TLOG "ignoring bogus LDFLAGS=\"${LDFLAGS}\""
          fi
      else
          AC_LDFLAGS=${CFLAGS:-"-g"}
      fi
    else
      AC_FAIL " does not compile code properly"
    fi

    AC_SUB 'CC' "$AC_CC"

    rm -f /tmp/ngc$$ /tmp/ngc$$.c /tmp/ngc$$.o

    return $status
}


#
# acLookFor actually looks for a program, without setting anything.
#
acLookFor () {
    path=${AC_PATH:-$ac_default_path}
    case "X$1" in
    X-[rx]) __mode=$1
          shift
          ;;
    *)          __mode=-x
          ;;
    esac
    oldifs="$IFS"
    for program in $*; do
      IFS=":"
      for x in $path; do
          if [ $__mode $x/$program -a -f $x/$program ]; then
            echo $x/$program
            break 2
          fi
      done
    done
    IFS="$oldifs"
    unset __mode
}


#
# check that a program exists and set its path
#
MF_PATH_INCLUDE () {
    SYM=$1; shift

    case X$1 in
    X-[rx]) __mode=$1
          shift
          ;;
    *)      unset __mode
          ;;
    esac

    TLOGN "looking for $1"

    DEST=`acLookFor $__mode $*`

    __sym=`echo "$SYM" | tr '[a-z]' '[A-Z]'`
    if [ "$DEST" ]; then
      TLOG " ($DEST)"
      echo "$1 is $DEST"
      AC_MAK $SYM
      AC_DEFINE PATH_$__sym \""$DEST"\"
      AC_SUB $__sym "$DEST"
      eval CF_$SYM=$DEST
      return 0
    else
      #AC_SUB $__sym ''
      echo "$1 is not found"
      TLOG " (not found)"
      return 1
    fi
}


#
# AC_INIT starts the ball rolling
#
# After AC_INIT, fd's 1 and 2 point to config.log
# and fd 5 points to what used to be fd 1
#
AC_INIT () {
    __config_files="config.cmd config.sub config.h config.mak config.log"
    rm -f $__config_files
    __cwd=`pwd`
    exec 5>&1 1>$__cwd/config.log 2>&1
    AC_CONFIGURE_FOR=__AC_`echo $1 | sed -e 's/\..$//' | tr 'a-z' 'A-Z' | tr ' ' '_'`_D

    # check to see whether to use echo -n or echo ...\c
    #
    echo -n hello > $$
    echo world >> $$
    if grep "helloworld" $$ >/dev/null; then
      ac_echo="echo -n"
      echo "[echo -n] works"
    else
      ac_echo="echo"
      echo 'hello\c' > $$
      echo 'world' >> $$
      if grep "helloworld" $$ >/dev/null; then
          ac_echo_nonl='\c'
          echo "[echo ...\\c] works"
      fi
    fi
    rm -f $$

    LOG "Configuring for [$1]"

    cat > $__cwd/config.h << EOF
/*
 * configuration for $1${2:+" ($2)"}, generated `date`
 * by ${LOGNAME:-`whoami`}@`hostname`
 */
#ifndef $AC_CONFIGURE_FOR
#define $AC_CONFIGURE_FOR 1


EOF

    unset __share
    if [ -d $AC_PREFIX/share/man ]; then
      for t in 1 2 3 4 5 6 7 8 9; do
          if [ -d $AC_PREFIX/share/man/man$t ]; then
            __share=/share
          elif [ -d $AC_PREFIX/share/man/cat$t ]; then
            __share=/share
          fi
      done
    else
      __share=
    fi

    if [ -d $AC_PREFIX/libexec ]; then
      __libexec=libexec
    else
      __libexec=lib
    fi


    AC_PREFIX=${AC_PREFIX:-/usr/local}
    AC_EXECDIR=${AC_EXECDIR:-$AC_PREFIX/bin}
    AC_SBINDIR=${AC_SBINDIR:-$AC_PREFIX/sbin}
    AC_LIBDIR=${AC_LIBDIR:-$AC_PREFIX/lib}
    AC_MANDIR=${AC_MANDIR:-$AC_PREFIX$__share/man}
    AC_LIBEXEC=${AC_LIBEXEC:-$AC_PREFIX/$__libexec}
    AC_CONFDIR=${AC_CONFDIR:-/etc}

    AC_PATH=${WITH_PATH:-$PATH}
    AC_PROG_CPP
    AC_PROG_INSTALL

    if [ -z "$ac_os" ]; then
      ac_os=`uname -s`
    fi
    _os=`echo $ac_os | tr '[a-z]' '[A-Z]'`
    AC_DEFINE OS_$_os   1
    eval OS_${_os}=1
    unset _os
}


#
# AC_LIBRARY checks to see if a given library exists and contains the
# given function.
# usage: AC_LIBRARY function library [alternate ...]
#
AC_LIBRARY() {
    SRC=$1
    shift

    # first see if the function can be found in any of the
    # current libraries
    AC_QUIET AC_CHECK_FUNCS $SRC && return 0

    # then search through the list of libraries
    __libs="$LIBS"
    for x in $*; do
      LIBS="$__libs $x"
      if AC_QUIET AC_CHECK_FUNCS $SRC; then
          AC_LIBS="$AC_LIBS $x"
          return 0
      fi
    done
    return 1
}


#
# AC_PROG_LEX checks to see if LEX exists, and if it's lex or flex.
#
AC_PROG_LEX() {
    TLOGN "looking for lex "

    DEST=`acLookFor lex`
    if [ "$DEST" ]; then
      AC_MAK LEX
      AC_DEFINE PATH_LEX \"$DEST\"
      AC_SUB 'LEX' "$DEST"
      echo "lex is $DEST"
    else
      DEST=`acLookFor flex`
      if [ "$DEST" ]; then
          AC_MAK FLEX
          AC_DEFINE 'LEX' \"$DEST\"
          AC_SUB 'LEX', "$DEST"
          echo "lex is $DEST"
      else
          AC_SUB LEX ''
          echo "neither lex or flex found"
          TLOG " (not found)"
          return 1
      fi
    fi

    if AC_LIBRARY yywrap -ll -lfl; then
      TLOG "($DEST)"
      return 0
    fi
    TLOG "(no lex library found)"
    return 1
}


#
# AC_PROG_YACC checks to see if YACC exists, and if it's bison or
# not.
#
AC_PROG_YACC () {

    TLOGN "looking for yacc "

    DEST=`acLookFor yacc`
    if [ "$DEST" ]; then
      AC_MAK YACC
      AC_DEFINE PATH_YACC \"$DEST\"
      AC_SUB 'YACC' "$DEST"
      TLOG "($DEST)"
      echo "yacc is $DEST"
    else
      DEST=`acLookFor bison`
      if [ "$DEST" ]; then
          AC_MAK BISON
          AC_DEFINE 'YACC' \"$DEST\"
          AC_SUB 'YACC' "$DEST -y"
          echo "yacc is $DEST -y"
          TLOG "($DEST -y)"
      else
          AC_SUB 'YACC' ''
          echo "neither yacc or bison found"
          TLOG " (not found)"
          return 1
      fi
    fi
    return 0
}


#
# AC_PROG_LN_S checks to see if ln exists, and, if so, if ln -s works
#
AC_PROG_LN_S () {
    test "$AC_FIND_PROG" || AC_PROG_FIND

    test "$AC_FIND_PROG" || return 1
    
    TLOGN "looking for \"ln -s\""
    DEST=`acLookFor ln`

    if [ "$DEST" ]; then
      rm -f /tmp/b$$
      $DEST -s /tmp/a$$ /tmp/b$$
      if [ "`$AC_FIND_PROG /tmp/b$$ -type l -print`" ]; then
          TLOG " ($DEST)"
          echo "$DEST exists, and ln -s works"
          AC_SUB 'LN_S' "$DEST -s"
          rm -f /tmp/b$$
      else
          AC_SUB 'LN_S' ''
          TLOG " ($DEST exists, but -s does not seem to work)"
          echo "$DEST exists, but ln -s doesn't seem to work"
          rm -f /tmp/b$$
          return 1
      fi
    else
      AC_SUB 'LN_S' ''
      echo "ln not found"
      TLOG " (not found)"
      return 1
    fi
}


#
# AC_PROG_FIND looks for the find program and sets the FIND environment
# variable
#
AC_PROG_FIND () {
    if test -z "$AC_FIND_PROG"; then
      MF_PATH_INCLUDE FIND find
      rc=$?
      AC_FIND_PROG=$DEST
      return $rc
    fi
    return 0
}


#
# AC_PROG_AWK looks for the awk program and sets the AWK environment
# variable
#
AC_PROG_AWK () {
    if test -z "$AC_AWK_PROG"; then
      MF_PATH_INCLUDE AWK awk
      rc=$?
      AC_AWK_PROG=$DEST
      return $rc
    fi
    return 0
}


#
# AC_PROG_SED looks for the sed program and sets the SED environment
# variable
#
AC_PROG_SED () {
    if test -z "$AC_SED_PROG"; then
      MF_PATH_INCLUDE SED sed
      rc=$?
      AC_SED_PROG=$DEST
      return $rc
    fi
    return 0
}


#
# AC_HEADER_SYS_WAIT looks for sys/wait.h
#
AC_HEADER_SYS_WAIT () {
    AC_CHECK_HEADERS sys/wait.h || return 1
}

#
# AC_TYPE_PID_T checks to see if the pid_t type exists
#
AC_TYPE_PID_T () {
    cat > /tmp/pd$$.c << EOF
#include <sys/types.h>
main() { pid_t me; }
EOF

    LOGN "checking for pid_t"

    if $AC_CC -c /tmp/pd$$.c -o /tmp/pd$$.o; then
      TLOG " (found)"
      rc=0
    else
      echo "typedef int pid_t;" >> $__cwd/config.h
      TLOG " (not found)"
      rc=1
    fi
    rm -f /tmp/pd$$.o /tmp/pd$$.c
    return $rc
}


#
# AC_C_CONST checks to see if the compiler supports the const keyword
#
AC_C_CONST () {
    cat > /tmp/pd$$.c << EOF
const char me=1;
EOF
    LOGN "checking for \"const\" keyword"

    if $AC_CC -c /tmp/pd$$.c -o /tmp/pd$$.o; then
      TLOG " (yes)"
      rc=0
    else
      AC_DEFINE 'const' '/**/'
      TLOG " (no)"
      rc=1
    fi
    rm -f /tmp/pd$$.o /tmp/pd$$.c
    return $rc
}


#
# AC_SCALAR_TYPES checks to see if the compiler can generate 2 and 4 byte ints.
#
AC_SCALAR_TYPES () {
    cat > /tmp/pd$$.c << EOF
#include <stdio.h>
main()
{
    unsigned long v_long;
    unsigned int v_int;
    unsigned short v_short;

    if (sizeof v_long == 4)
      puts("#define DWORD     unsigned long");
    else if (sizeof v_int == 4)
      puts("#define DWORD     unsigned int");
    else
      exit(1);

    if (sizeof v_int == 2)
      puts("#define WORD      unsigned int");
    else if (sizeof v_short == 2)
      puts("#define WORD      unsigned short");
    else
      exit(2);
    puts("#define BYTE  unsigned char");
    exit(0);
}
EOF
    rc=1
    LOGN "defining WORD & DWORD scalar types"
    if $AC_CC /tmp/pd$$.c -o /tmp/pd$$; then
      if /tmp/pd$$  >> $__cwd/config.h; then
          rc=0
      fi
    fi
    case "$rc" in
    0) TLOG "" ;;
    *) TLOG " ** FAILED **" ;;
    esac
    rm -f /tmp/pd$$ /tmp/pd$$.c
}


#
# AC_OUTPUT generates makefiles from makefile.in's
#
AC_OUTPUT () {
    cd $__cwd
    AC_SUB 'LIBS'    "$AC_LIBS"
    AC_SUB 'CONFIGURE_FILES' "$__config_files"
    AC_SUB 'GENERATED_FILES' "$*"
    AC_SUB 'CFLAGS'  "$AC_CFLAGS"
    AC_SUB 'LDFLAGS' "$AC_LDFLAGS"
    AC_SUB 'srcdir'  "$AC_SRCDIR"
    AC_SUB 'prefix'  "$AC_PREFIX"
    AC_SUB 'exedir'  "$AC_EXECDIR"
    AC_SUB 'sbindir' "$AC_SBINDIR"
    AC_SUB 'libdir'  "$AC_LIBDIR"
    AC_SUB 'libexec' "$AC_LIBEXEC"
    AC_SUB 'confdir' "$AC_CONFDIR"
    AC_SUB 'mandir'  "$AC_MANDIR"

    if [ -r config.sub ]; then
      test "$AC_SED_PROG" || AC_PROG_SED
      test "$AC_SED_PROG" || return 1

      echo                                   >> config.h
      echo "#endif/* ${AC_CONFIGURE_FOR} */" >> config.h

      rm -f config.cmd
      Q=\'
      cat - > config.cmd << EOF
#! /bin/sh
${CC:+CC=${Q}${CC}${Q}}${CFLAGS:+ CFLAGS=${Q}${CFLAGS}${Q}}${LDFLAGS:+ LDFLAGS=${Q}${LDFLAGS}${Q}} $ac_progname $ac_configure_command
EOF
      chmod +x config.cmd

      __d=$AC_SRCDIR
      for makefile in $*;do
          if test -r $__d/${makefile}.in; then
            LOG "generating $makefile"
            ./config.md `__ac_dirname ./$makefile` 2>/dev/null
            $AC_SED_PROG -f config.sub < $__d/${makefile}.in > $makefile
            __config_files="$__config_files $makefile"
          else
            LOG "WARNING: ${makefile}.in does not exist!"
          fi
      done
      unset __d

    else
      echo 
    fi
}

#
# AC_CHECK_FLOCK checks to see if flock() exists and if the LOCK_NB argument
# works properly.
#
AC_CHECK_FLOCK() {

    AC_CHECK_HEADERS sys/types.h sys/file.h fcntl.h

    cat << EOF > $$.c
#include <stdio.h>
#include <sys/file.h>
#include <sys/types.h>
#include <fcntl.h>

main()
{
    int x = open("$$.c", O_RDWR, 0666);
    int y = open("$$.c", O_RDWR, 0666);

    if (flock(x, LOCK_EX) != 0)
      exit(1);
    if (flock(y, LOCK_EX|LOCK_NB) == 0)
      exit(1);
    exit(0);
}
EOF

    LOGN "checking for flock()"
    HAS_FLOCK=0
    if $AC_CC -o flock $$.c ; then
      if ./flock ; then
          LOG " (found)"
          HAS_FLOCK=1
          AC_DEFINE HAS_FLOCK
      else
          LOG " (bad)"
      fi
    else
      LOG " (no)"
    fi

    rm -f flock $$.c

    case "$HAS_FLOCK" in
    0) return 1 ;;
    *) return 0 ;;
    esac
}


#
# AC_PROG_INSTALL finds the install program and guesses whether it's a 
# Berkeley or GNU install program
#
AC_PROG_INSTALL () {

    DEST=`acLookFor install`

    LOGN "checking for install"
    unset IS_BSD
    if [ "$DEST" ]; then
      # BSD install or GNU install?  Let's find out...
      touch /tmp/a$$

      $DEST /tmp/a$$ /tmp/b$$

      if test -r /tmp/a$$; then
          LOG " ($DEST)"
      else
          IS_BSD=1
          LOG " ($DEST) bsd install"
      fi
      rm -f /tmp/a$$ /tmp/b$$
    else
      DEST=`acLookFor ginstall`
      if [ "$DEST" ]; then
          LOG " ($DEST)"
      else
          DEST="false"
          LOG " (not found)"
      fi
    fi

    if [ "$IS_BSD" ]; then
      PROG_INSTALL="$DEST -c"
    else
      PROG_INSTALL="$DEST"
    fi

    AC_SUB 'INSTALL' "$PROG_INSTALL"
    AC_SUB 'INSTALL_PROGRAM' "$PROG_INSTALL -s -m 755"
    AC_SUB 'INSTALL_DATA' "$PROG_INSTALL -m 444"

    # finally build a little directory installer
    # if mkdir -p works, use that, otherwise use install -d,
    # otherwise build a script to do it by hand.
    # in every case, test to see if the directory exists before
    # making it.

    if mkdir -p $$a/b; then
      # I like this method best.
      __mkdir="mkdir -p"
      rmdir $$a/b
      rmdir $$a
    elif $PROG_INSTALL -d $$a/b; then
      __mkdir="$PROG_INSTALL -d"
      rmdir $$a/b
      rmdir $$a
    fi

    __config_files="$__config_files config.md"
    AC_SUB 'INSTALL_DIR' "$__cwd/config.md"
    echo "#! /bin/sh"                                   > $__cwd/config.md
    echo "# script generated" `date` "by configure.sh" >> $__cwd/config.md
    echo                                               >> $__cwd/config.md
    if [ "$__mkdir" ]; then
      echo "test -d \"\$1\" || $__mkdir \"\$1\""     >> $__cwd/config.md
      echo "exit $?"                                 >> $__cwd/config.md
    else
      cat - >> $__cwd/config.md << \EOD
pieces=`IFS=/; for x in $1; do echo $x; done`
dir=
for x in $pieces; do
    dir="$dir$x"
    mkdir $dir || exit 1
    dir="$dir/"
done
exit 0
EOD
    fi
    chmod +x $__cwd/config.md
}

#
# acCheckCPP is a local that runs a C preprocessor with a given set of
# compiler options
#
acCheckCPP () {
      cat > /tmp/ngc$$.c << EOF
#define FOO BAR

FOO
EOF

    if $1 $2 /tmp/ngc$$.c > /tmp/ngc$$.o; then
      if grep -v '#define' /tmp/ngc$$.o | grep -s BAR >/dev/null; then
          echo "CPP=[$1], CPPFLAGS=[$2]"
          AC_SUB 'CPP' "$1"
          AC_SUB 'CPPFLAGS' "$2"
          rm /tmp/ngc$$.c /tmp/ngc$$.o
          return 0
      fi
    fi
    rm /tmp/ngc$$.c /tmp/ngc$$.o
    return 1
}


#
# AC_PROG_CPP checks for cpp, then checks to see which CPPFLAGS are needed
# to run it as a filter.
#
AC_PROG_CPP () {
    if [ "$AC_CPP_PROG" ]; then
      DEST=$AC_CPP_PROG
    else
      __ac_path="$AC_PATH"
      AC_PATH="/lib:/usr/lib:${__ac_path:-$ac_default_path}"
      DEST=`acLookFor cpp`
      AC_PATH="$__ac_path"
    fi

    unset fail
    LOGN "Looking for cpp"
    if [ "$DEST" ]; then
      TLOGN " ($DEST)"
      acCheckCPP $DEST "$CPPFLAGS" || \
             acCheckCPP $DEST -traditional-cpp -E || \
             acCheckCPP $DEST -E || \
             acCheckCPP $DEST -traditional-cpp -pipe || \
               acCheckCPP $DEST -pipe || fail=1

      if [ "$fail" ]; then
          AC_FAIL " (can't run cpp as a pipeline)"
      else
          TLOG " ok"
          return 0
      fi
    fi
    AC_FAIL " (not found)"
}

#
# AC_FAIL spits out an error message, then __fail's 
AC_FAIL() {
    LOG "$*" 
    $__fail 1
}

#
# AC_SUB writes a substitution into config.sub
AC_SUB() {
    (   _subst=`echo $2 | sed -e 's/;/\\;/g'`
      echo "s;@$1@;$_subst;g" ) >> $__cwd/config.sub
}

#
# AC_MAK writes a define into config.mak
AC_MAK() {
    echo "HAVE_$1 = 1" >> $__cwd/config.mak
}

#
# AC_DEFINE adds a #define to config.h
AC_DEFINE() {
    echo "#define $1 ${2:-1}" >> $__cwd/config.h
}

#
# AC_CONFIG adds a configuration setting to all the config files
AC_CONFIG() {
    AC_DEFINE "PATH_$1" \""$2"\"
    AC_MAK "$1"
    AC_SUB "$1" "$2"
}

#
# AC_QUIET does something quietly
AC_QUIET() {
    eval $* 5>/dev/null
}

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