I'm not sure if I add any value to the discussion here, but I would be so glad 
to see this merged/included into vim.

Also, there's a discussion about this on vim reddit here: 
http://www.reddit.com/r/vim/comments/2ozwe4/24_bit_vim_in_osx_iterm2_a_reality/

(that's how I found about this in the first place).

On Saturday, January 26, 2013 10:09:49 PM UTC+1, ZyX wrote:
> The following patch adds support for guifg/guibg properties of highlight 
> groups in ISO-8613-3 (at least 
> http://invisible-island.net/xterm/ctlseqs/ctlseqs.html page states it is 
> ISO-8613-3) supporting terminals (only Konsole and ConEmu are currently known 
> to support this). This patch have two intentions: add actual gui colorschemes 
> support for konsole users and create a reason for other terminal emulator 
> authors to add support for true color.
> 
> diff -r 274c841f033a -r f15e368e2fc6 runtime/doc/options.txt
> --- a/runtime/doc/options.txt Fri Jan 25 20:11:01 2013 +0100
> +++ b/runtime/doc/options.txt Sun Jan 27 00:44:09 2013 +0400
> @@ -3341,6 +3341,16 @@
>       This option cannot be set from a |modeline| or in the |sandbox|, for
>       security reasons.
>  
> +                                             *'guicolors'* *'gcol'*
> +'guicolors' 'gcol'   boolean (default off)
> +                     global
> +                     {not in Vi}
> +                     {not available when compiled without the 
> +                     |+termtruecolor| feature}
> +     When on, uses |highlight-guifg| and |highlight-guibg| attributes in 
> +     terminal (thus using 24-bit color). Requires ISO-8613-3 compatible 
> +     terminal.
> +
>                       *'guicursor'* *'gcr'* *E545* *E546* *E548* *E549*
>  'guicursor' 'gcr'    string  (default "n-v-c:block-Cursor/lCursor,
>                                       ve:ver35-Cursor,
> diff -r 274c841f033a -r f15e368e2fc6 runtime/doc/various.txt
> --- a/runtime/doc/various.txt Fri Jan 25 20:11:01 2013 +0100
> +++ b/runtime/doc/various.txt Sun Jan 27 00:44:09 2013 +0400
> @@ -399,6 +399,7 @@
>  m  *+tcl/dyn*                Tcl interface |tcl-dynamic| |/dyn|
>     *+terminfo*               uses |terminfo| instead of termcap
>  N  *+termresponse*   support for |t_RV| and |v:termresponse|
> +m  *+termtruecolor*  24-bit color in xterm-compatible terminals support
>  N  *+textobjects*    |text-objects| selection
>     *+tgetent*                non-Unix only: able to use external termcap
>  N  *+title*          Setting the window 'title' and 'icon'
> diff -r 274c841f033a -r f15e368e2fc6 src/auto/configure
> --- a/src/auto/configure      Fri Jan 25 20:11:01 2013 +0100
> +++ b/src/auto/configure      Sun Jan 27 00:44:09 2013 +0400
> @@ -1,11 +1,9 @@
>  #! /bin/sh
>  # Guess values for system-dependent variables and create Makefiles.
> -# Generated by GNU Autoconf 2.65.
> +# Generated by GNU Autoconf 2.69.
>  #
>  #
> -# Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001,
> -# 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation,
> -# Inc.
> +# Copyright (C) 1992-1996, 1998-2012 Free Software Foundation, Inc.
>  #
>  #
>  # This configure script is free software; the Free Software Foundation
> @@ -89,6 +87,7 @@
>  IFS=" ""     $as_nl"
>  
>  # Find who we are.  Look in the path if we contain no directory separator.
> +as_myself=
>  case $0 in #((
>    *[\\/]* ) as_myself=$0 ;;
>    *) as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
> @@ -133,6 +132,31 @@
>  # CDPATH.
>  (unset CDPATH) >/dev/null 2>&1 && unset CDPATH
>  
> +# Use a proper internal environment variable to ensure we don't fall
> +  # into an infinite loop, continuously re-executing ourselves.
> +  if test x"${_as_can_reexec}" != xno && test "x$CONFIG_SHELL" != x; then
> +    _as_can_reexec=no; export _as_can_reexec;
> +    # We cannot yet assume a decent shell, so we have to provide a
> +# neutralization value for shells without unset; and this also
> +# works around shells that cannot unset nonexistent variables.
> +# Preserve -v and -x to the replacement shell.
> +BASH_ENV=/dev/null
> +ENV=/dev/null
> +(unset BASH_ENV) >/dev/null 2>&1 && unset BASH_ENV ENV
> +case $- in # ((((
> +  *v*x* | *x*v* ) as_opts=-vx ;;
> +  *v* ) as_opts=-v ;;
> +  *x* ) as_opts=-x ;;
> +  * ) as_opts= ;;
> +esac
> +exec $CONFIG_SHELL $as_opts "$as_myself" ${1+"$@"}
> +# Admittedly, this is quite paranoid, since all the known shells bail
> +# out after a failed `exec'.
> +$as_echo "$0: could not re-execute with $CONFIG_SHELL" >&2
> +as_fn_exit 255
> +  fi
> +  # We don't want this to propagate to other subprocesses.
> +          { _as_can_reexec=; unset _as_can_reexec;}
>  if test "x$CONFIG_SHELL" = x; then
>    as_bourne_compatible="if test -n \"\${ZSH_VERSION+set}\" && (emulate sh) 
> >/dev/null 2>&1; then :
>    emulate sh
> @@ -166,7 +190,8 @@
>  else
>    exitcode=1; echo positional parameters were not saved.
>  fi
> -test x\$exitcode = x0 || exit 1"
> +test x\$exitcode = x0 || exit 1
> +test -x / || exit 1"
>    as_suggested="  
> as_lineno_1=";as_suggested=$as_suggested$LINENO;as_suggested=$as_suggested" 
> as_lineno_1a=\$LINENO
>    
> as_lineno_2=";as_suggested=$as_suggested$LINENO;as_suggested=$as_suggested" 
> as_lineno_2a=\$LINENO
>    eval 'test \"x\$as_lineno_1'\$as_run'\" != \"x\$as_lineno_2'\$as_run'\" &&
> @@ -211,14 +236,25 @@
>  
>  
>        if test "x$CONFIG_SHELL" != x; then :
> -  # We cannot yet assume a decent shell, so we have to provide a
> -     # neutralization value for shells without unset; and this also
> -     # works around shells that cannot unset nonexistent variables.
> -     BASH_ENV=/dev/null
> -     ENV=/dev/null
> -     (unset BASH_ENV) >/dev/null 2>&1 && unset BASH_ENV ENV
> -     export CONFIG_SHELL
> -     exec "$CONFIG_SHELL" "$as_myself" ${1+"$@"}
> +  export CONFIG_SHELL
> +             # We cannot yet assume a decent shell, so we have to provide a
> +# neutralization value for shells without unset; and this also
> +# works around shells that cannot unset nonexistent variables.
> +# Preserve -v and -x to the replacement shell.
> +BASH_ENV=/dev/null
> +ENV=/dev/null
> +(unset BASH_ENV) >/dev/null 2>&1 && unset BASH_ENV ENV
> +case $- in # ((((
> +  *v*x* | *x*v* ) as_opts=-vx ;;
> +  *v* ) as_opts=-v ;;
> +  *x* ) as_opts=-x ;;
> +  * ) as_opts= ;;
> +esac
> +exec $CONFIG_SHELL $as_opts "$as_myself" ${1+"$@"}
> +# Admittedly, this is quite paranoid, since all the known shells bail
> +# out after a failed `exec'.
> +$as_echo "$0: could not re-execute with $CONFIG_SHELL" >&2
> +exit 255
>  fi
>  
>      if test x$as_have_required = xno; then :
> @@ -316,10 +352,18 @@
>        test -d "$as_dir" && break
>      done
>      test -z "$as_dirs" || eval "mkdir $as_dirs"
> -  } || test -d "$as_dir" || as_fn_error "cannot create directory $as_dir"
> +  } || test -d "$as_dir" || as_fn_error $? "cannot create directory $as_dir"
>  
>  
>  } # as_fn_mkdir_p
> +
> +# as_fn_executable_p FILE
> +# -----------------------
> +# Test if FILE is an executable regular file.
> +as_fn_executable_p ()
> +{
> +  test -f "$1" && test -x "$1"
> +} # as_fn_executable_p
>  # as_fn_append VAR VALUE
>  # ----------------------
>  # Append the text in VALUE to the end of the definition contained in VAR. 
> Take
> @@ -356,19 +400,19 @@
>  fi # as_fn_arith
>  
>  
> -# as_fn_error ERROR [LINENO LOG_FD]
> -# ---------------------------------
> +# as_fn_error STATUS ERROR [LINENO LOG_FD]
> +# ----------------------------------------
>  # Output "`basename $0`: error: ERROR" to stderr. If LINENO and LOG_FD are
>  # provided, also output the error to LOG_FD, referencing LINENO. Then exit 
> the
> -# script with status $?, using 1 if that was 0.
> +# script with STATUS, using 1 if that was 0.
>  as_fn_error ()
>  {
> -  as_status=$?; test $as_status -eq 0 && as_status=1
> -  if test "$3"; then
> -    as_lineno=${as_lineno-"$2"} 
> as_lineno_stack=as_lineno_stack=$as_lineno_stack
> -    $as_echo "$as_me:${as_lineno-$LINENO}: error: $1" >&$3
> -  fi
> -  $as_echo "$as_me: error: $1" >&2
> +  as_status=$1; test $as_status -eq 0 && as_status=1
> +  if test "$4"; then
> +    as_lineno=${as_lineno-"$3"} 
> as_lineno_stack=as_lineno_stack=$as_lineno_stack
> +    $as_echo "$as_me:${as_lineno-$LINENO}: error: $2" >&$4
> +  fi
> +  $as_echo "$as_me: error: $2" >&2
>    as_fn_exit $as_status
>  } # as_fn_error
>  
> @@ -441,6 +485,10 @@
>    chmod +x "$as_me.lineno" ||
>      { $as_echo "$as_me: error: cannot create $as_me.lineno; rerun with a 
> POSIX shell" >&2; as_fn_exit 1; }
>  
> +  # If we had to re-execute with $CONFIG_SHELL, we're ensured to have
> +  # already done that, so ensure we don't try to do so again and fall
> +  # in an infinite loop.  This has already happened in practice.
> +  _as_can_reexec=no; export _as_can_reexec
>    # Don't try to exec as it changes $[0], causing all sort of problems
>    # (the dirname of $[0] is not the place where we might find the
>    # original and so on.  Autoconf is especially sensitive to this).
> @@ -475,16 +523,16 @@
>      # ... but there are two gotchas:
>      # 1) On MSYS, both `ln -s file dir' and `ln file dir' fail.
>      # 2) DJGPP < 2.04 has no symlinks; `ln -s' creates a wrapper executable.
> -    # In both cases, we have to default to `cp -p'.
> +    # In both cases, we have to default to `cp -pR'.
>      ln -s conf$$.file conf$$.dir 2>/dev/null && test ! -f conf$$.exe ||
> -      as_ln_s='cp -p'
> +      as_ln_s='cp -pR'
>    elif ln conf$$.file conf$$ 2>/dev/null; then
>      as_ln_s=ln
>    else
> -    as_ln_s='cp -p'
> -  fi
> -else
> -  as_ln_s='cp -p'
> +    as_ln_s='cp -pR'
> +  fi
> +else
> +  as_ln_s='cp -pR'
>  fi
>  rm -f conf$$ conf$$.exe conf$$.dir/conf$$.file conf$$.file
>  rmdir conf$$.dir 2>/dev/null
> @@ -496,28 +544,8 @@
>    as_mkdir_p=false
>  fi
>  
> -if test -x / >/dev/null 2>&1; then
> -  as_test_x='test -x'
> -else
> -  if ls -dL / >/dev/null 2>&1; then
> -    as_ls_L_option=L
> -  else
> -    as_ls_L_option=
> -  fi
> -  as_test_x='
> -    eval sh -c '\''
> -      if test -d "$1"; then
> -     test -d "$1/.";
> -      else
> -     case $1 in #(
> -     -*)set "./$1";;
> -     esac;
> -     case `ls -ld'$as_ls_L_option' "$1" 2>/dev/null` in #((
> -     ???[sx]*):;;*)false;;esac;fi
> -    '\'' sh
> -  '
> -fi
> -as_executable_p=$as_test_x
> +as_test_x='test -x'
> +as_executable_p=as_fn_executable_p
>  
>  # Sed expression to map a string onto a valid CPP name.
>  as_tr_cpp="eval sed 
> 'y%*$as_cr_letters%P$as_cr_LETTERS%;s%[^_$as_cr_alnum]%_%g'"
> @@ -530,7 +558,7 @@
>  exec 6>&1
>  
>  # Name of the host.
> -# hostname on some systems (SVR3.2, Linux) returns a bogus exit status,
> +# hostname on some systems (SVR3.2, old GNU/Linux) returns a bogus exit 
> status,
>  # so uname gets run too.
>  ac_hostname=`(hostname || uname -n) 2>/dev/null | sed 1q`
>  
> @@ -770,6 +798,7 @@
>  enable_rubyinterp
>  with_ruby_command
>  enable_cscope
> +enable_termtruecolor
>  enable_workshop
>  enable_netbeans
>  enable_sniff
> @@ -869,8 +898,9 @@
>    fi
>  
>    case $ac_option in
> -  *=*)       ac_optarg=`expr "X$ac_option" : '[^=]*=\(.*\)'` ;;
> -  *) ac_optarg=yes ;;
> +  *=?*) ac_optarg=`expr "X$ac_option" : '[^=]*=\(.*\)'` ;;
> +  *=)   ac_optarg= ;;
> +  *)    ac_optarg=yes ;;
>    esac
>  
>    # Accept the important Cygnus configure options, so we can diagnose typos.
> @@ -915,7 +945,7 @@
>      ac_useropt=`expr "x$ac_option" : 'x-*disable-\(.*\)'`
>      # Reject names that are not valid shell variable names.
>      expr "x$ac_useropt" : ".*[^-+._$as_cr_alnum]" >/dev/null &&
> -      as_fn_error "invalid feature name: $ac_useropt"
> +      as_fn_error $? "invalid feature name: $ac_useropt"
>      ac_useropt_orig=$ac_useropt
>      ac_useropt=`$as_echo "$ac_useropt" | sed 's/[-+.]/_/g'`
>      case $ac_user_opts in
> @@ -941,7 +971,7 @@
>      ac_useropt=`expr "x$ac_option" : 'x-*enable-\([^=]*\)'`
>      # Reject names that are not valid shell variable names.
>      expr "x$ac_useropt" : ".*[^-+._$as_cr_alnum]" >/dev/null &&
> -      as_fn_error "invalid feature name: $ac_useropt"
> +      as_fn_error $? "invalid feature name: $ac_useropt"
>      ac_useropt_orig=$ac_useropt
>      ac_useropt=`$as_echo "$ac_useropt" | sed 's/[-+.]/_/g'`
>      case $ac_user_opts in
> @@ -1145,7 +1175,7 @@
>      ac_useropt=`expr "x$ac_option" : 'x-*with-\([^=]*\)'`
>      # Reject names that are not valid shell variable names.
>      expr "x$ac_useropt" : ".*[^-+._$as_cr_alnum]" >/dev/null &&
> -      as_fn_error "invalid package name: $ac_useropt"
> +      as_fn_error $? "invalid package name: $ac_useropt"
>      ac_useropt_orig=$ac_useropt
>      ac_useropt=`$as_echo "$ac_useropt" | sed 's/[-+.]/_/g'`
>      case $ac_user_opts in
> @@ -1161,7 +1191,7 @@
>      ac_useropt=`expr "x$ac_option" : 'x-*without-\(.*\)'`
>      # Reject names that are not valid shell variable names.
>      expr "x$ac_useropt" : ".*[^-+._$as_cr_alnum]" >/dev/null &&
> -      as_fn_error "invalid package name: $ac_useropt"
> +      as_fn_error $? "invalid package name: $ac_useropt"
>      ac_useropt_orig=$ac_useropt
>      ac_useropt=`$as_echo "$ac_useropt" | sed 's/[-+.]/_/g'`
>      case $ac_user_opts in
> @@ -1191,8 +1221,8 @@
>    | --x-librar=* | --x-libra=* | --x-libr=* | --x-lib=* | --x-li=* | --x-l=*)
>      x_libraries=$ac_optarg ;;
>  
> -  -*) as_fn_error "unrecognized option: \`$ac_option'
> -Try \`$0 --help' for more information."
> +  -*) as_fn_error $? "unrecognized option: \`$ac_option'
> +Try \`$0 --help' for more information"
>      ;;
>  
>    *=*)
> @@ -1200,7 +1230,7 @@
>      # Reject names that are not valid shell variable names.
>      case $ac_envvar in #(
>        '' | [0-9]* | *[!_$as_cr_alnum]* )
> -      as_fn_error "invalid variable name: \`$ac_envvar'" ;;
> +      as_fn_error $? "invalid variable name: \`$ac_envvar'" ;;
>      esac
>      eval $ac_envvar=\$ac_optarg
>      export $ac_envvar ;;
> @@ -1210,7 +1240,7 @@
>      $as_echo "$as_me: WARNING: you should use --build, --host, --target" >&2
>      expr "x$ac_option" : ".*[^-._$as_cr_alnum]" >/dev/null &&
>        $as_echo "$as_me: WARNING: invalid host type: $ac_option" >&2
> -    : ${build_alias=$ac_option} ${host_alias=$ac_option} 
> ${target_alias=$ac_option}
> +    : "${build_alias=$ac_option} ${host_alias=$ac_option} 
> ${target_alias=$ac_option}"
>      ;;
>  
>    esac
> @@ -1218,13 +1248,13 @@
>  
>  if test -n "$ac_prev"; then
>    ac_option=--`echo $ac_prev | sed 's/_/-/g'`
> -  as_fn_error "missing argument to $ac_option"
> +  as_fn_error $? "missing argument to $ac_option"
>  fi
>  
>  if test -n "$ac_unrecognized_opts"; then
>    case $enable_option_checking in
>      no) ;;
> -    fatal) as_fn_error "unrecognized options: $ac_unrecognized_opts" ;;
> +    fatal) as_fn_error $? "unrecognized options: $ac_unrecognized_opts" ;;
>      *)     $as_echo "$as_me: WARNING: unrecognized options: 
> $ac_unrecognized_opts" >&2 ;;
>    esac
>  fi
> @@ -1247,7 +1277,7 @@
>      [\\/$]* | ?:[\\/]* )  continue;;
>      NONE | '' ) case $ac_var in *prefix ) continue;; esac;;
>    esac
> -  as_fn_error "expected an absolute directory name for --$ac_var: $ac_val"
> +  as_fn_error $? "expected an absolute directory name for --$ac_var: $ac_val"
>  done
>  
>  # There might be people who depend on the old broken behavior: `$host'
> @@ -1261,8 +1291,6 @@
>  if test "x$host_alias" != x; then
>    if test "x$build_alias" = x; then
>      cross_compiling=maybe
> -    $as_echo "$as_me: WARNING: If you wanted to set the --build type, don't 
> use --host.
> -    If a cross compiler is detected then cross compile mode will be used." 
> >&2
>    elif test "x$build_alias" != "x$host_alias"; then
>      cross_compiling=yes
>    fi
> @@ -1277,9 +1305,9 @@
>  ac_pwd=`pwd` && test -n "$ac_pwd" &&
>  ac_ls_di=`ls -di .` &&
>  ac_pwd_ls_di=`cd "$ac_pwd" && ls -di .` ||
> -  as_fn_error "working directory cannot be determined"
> +  as_fn_error $? "working directory cannot be determined"
>  test "X$ac_ls_di" = "X$ac_pwd_ls_di" ||
> -  as_fn_error "pwd does not report name of working directory"
> +  as_fn_error $? "pwd does not report name of working directory"
>  
>  
>  # Find the source files, if location was not specified.
> @@ -1318,11 +1346,11 @@
>  fi
>  if test ! -r "$srcdir/$ac_unique_file"; then
>    test "$ac_srcdir_defaulted" = yes && srcdir="$ac_confdir or .."
> -  as_fn_error "cannot find sources ($ac_unique_file) in $srcdir"
> +  as_fn_error $? "cannot find sources ($ac_unique_file) in $srcdir"
>  fi
>  ac_msg="sources are in $srcdir, but \`cd $srcdir' does not work"
>  ac_abs_confdir=`(
> -     cd "$srcdir" && test -r "./$ac_unique_file" || as_fn_error "$ac_msg"
> +     cd "$srcdir" && test -r "./$ac_unique_file" || as_fn_error $? "$ac_msg"
>       pwd)`
>  # When building in place, set srcdir=.
>  if test "$ac_abs_confdir" = "$ac_pwd"; then
> @@ -1362,7 +1390,7 @@
>        --help=short        display options specific to this package
>        --help=recursive    display the short help of all the included packages
>    -V, --version           display version information and exit
> -  -q, --quiet, --silent   do not print \`checking...' messages
> +  -q, --quiet, --silent   do not print \`checking ...' messages
>        --cache-file=FILE   cache test results in FILE [disabled]
>    -C, --config-cache      alias for \`--cache-file=config.cache'
>    -n, --no-create         do not create output files
> @@ -1433,6 +1461,7 @@
>    --enable-tclinterp      Include Tcl interpreter.
>    --enable-rubyinterp=OPTS     Include Ruby interpreter.  default=no 
> OPTS=no/yes/dynamic
>    --enable-cscope         Include cscope interface.
> +  --enable-termtruecolor      Include support for 24-bit colors in 
> ISO-8613-3 compatible terminals
>    --enable-workshop       Include Sun Visual Workshop support.
>    --disable-netbeans      Disable NetBeans integration support.
>    --enable-sniff          Include Sniff interface.
> @@ -1559,9 +1588,9 @@
>  if $ac_init_version; then
>    cat <<\_ACEOF
>  configure
> -generated by GNU Autoconf 2.65
> -
> -Copyright (C) 2009 Free Software Foundation, Inc.
> +generated by GNU Autoconf 2.69
> +
> +Copyright (C) 2012 Free Software Foundation, Inc.
>  This configure script is free software; the Free Software Foundation
>  gives unlimited permission to copy, distribute and modify it.
>  _ACEOF
> @@ -1605,7 +1634,7 @@
>  
>       ac_retval=1
>  fi
> -  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset 
> as_lineno;}
> +  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
>    as_fn_set_status $ac_retval
>  
>  } # ac_fn_c_try_compile
> @@ -1631,7 +1660,7 @@
>      mv -f conftest.er1 conftest.err
>    fi
>    $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
> -  test $ac_status = 0; } >/dev/null && {
> +  test $ac_status = 0; } > conftest.i && {
>        test -z "$ac_c_preproc_warn_flag$ac_c_werror_flag" ||
>        test ! -s conftest.err
>         }; then :
> @@ -1642,7 +1671,7 @@
>  
>      ac_retval=1
>  fi
> -  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset 
> as_lineno;}
> +  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
>    as_fn_set_status $ac_retval
>  
>  } # ac_fn_c_try_cpp
> @@ -1674,7 +1703,7 @@
>        test ! -s conftest.err
>         } && test -s conftest$ac_exeext && {
>        test "$cross_compiling" = yes ||
> -      $as_test_x conftest$ac_exeext
> +      test -x conftest$ac_exeext
>         }; then :
>    ac_retval=0
>  else
> @@ -1688,7 +1717,7 @@
>    # interfere with the next link command; also delete a directory that is
>    # left behind by Apple's compiler.  We do this before executing the 
> actions.
>    rm -rf conftest.dSYM conftest_ipa8_conftest.oo
> -  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset 
> as_lineno;}
> +  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
>    as_fn_set_status $ac_retval
>  
>  } # ac_fn_c_try_link
> @@ -1730,7 +1759,7 @@
>         ac_retval=$ac_status
>  fi
>    rm -rf conftest.dSYM conftest_ipa8_conftest.oo
> -  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset 
> as_lineno;}
> +  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
>    as_fn_set_status $ac_retval
>  
>  } # ac_fn_c_try_run
> @@ -1743,10 +1772,10 @@
>  ac_fn_c_check_header_mongrel ()
>  {
>    as_lineno=${as_lineno-"$1"} 
> as_lineno_stack=as_lineno_stack=$as_lineno_stack
> -  if { as_var=$3; eval "test \"\${$as_var+set}\" = set"; }; then :
> +  if eval \${$3+:} false; then :
>    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
>  $as_echo_n "checking for $2... " >&6; }
> -if { as_var=$3; eval "test \"\${$as_var+set}\" = set"; }; then :
> +if eval \${$3+:} false; then :
>    $as_echo_n "(cached) " >&6
>  fi
>  eval ac_res=\$$3
> @@ -1782,7 +1811,7 @@
>  else
>    ac_header_preproc=no
>  fi
> -rm -f conftest.err conftest.$ac_ext
> +rm -f conftest.err conftest.i conftest.$ac_ext
>  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_header_preproc" >&5
>  $as_echo "$ac_header_preproc" >&6; }
>  
> @@ -1809,7 +1838,7 @@
>  esac
>    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
>  $as_echo_n "checking for $2... " >&6; }
> -if { as_var=$3; eval "test \"\${$as_var+set}\" = set"; }; then :
> +if eval \${$3+:} false; then :
>    $as_echo_n "(cached) " >&6
>  else
>    eval "$3=\$ac_header_compiler"
> @@ -1818,7 +1847,7 @@
>              { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
>  $as_echo "$ac_res" >&6; }
>  fi
> -  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset 
> as_lineno;}
> +  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
>  
>  } # ac_fn_c_check_header_mongrel
>  
> @@ -1831,7 +1860,7 @@
>    as_lineno=${as_lineno-"$1"} 
> as_lineno_stack=as_lineno_stack=$as_lineno_stack
>    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
>  $as_echo_n "checking for $2... " >&6; }
> -if { as_var=$3; eval "test \"\${$as_var+set}\" = set"; }; then :
> +if eval \${$3+:} false; then :
>    $as_echo_n "(cached) " >&6
>  else
>    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
> @@ -1849,7 +1878,7 @@
>  eval ac_res=\$$3
>              { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
>  $as_echo "$ac_res" >&6; }
> -  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset 
> as_lineno;}
> +  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
>  
>  } # ac_fn_c_check_header_compile
>  
> @@ -1861,7 +1890,7 @@
>    as_lineno=${as_lineno-"$1"} 
> as_lineno_stack=as_lineno_stack=$as_lineno_stack
>    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
>  $as_echo_n "checking for $2... " >&6; }
> -if { as_var=$3; eval "test \"\${$as_var+set}\" = set"; }; then :
> +if eval \${$3+:} false; then :
>    $as_echo_n "(cached) " >&6
>  else
>    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
> @@ -1916,7 +1945,7 @@
>  eval ac_res=\$$3
>              { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
>  $as_echo "$ac_res" >&6; }
> -  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset 
> as_lineno;}
> +  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
>  
>  } # ac_fn_c_check_func
>  
> @@ -1929,7 +1958,7 @@
>    as_lineno=${as_lineno-"$1"} 
> as_lineno_stack=as_lineno_stack=$as_lineno_stack
>    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
>  $as_echo_n "checking for $2... " >&6; }
> -if { as_var=$3; eval "test \"\${$as_var+set}\" = set"; }; then :
> +if eval \${$3+:} false; then :
>    $as_echo_n "(cached) " >&6
>  else
>    eval "$3=no"
> @@ -1970,7 +1999,7 @@
>  eval ac_res=\$$3
>              { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
>  $as_echo "$ac_res" >&6; }
> -  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset 
> as_lineno;}
> +  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
>  
>  } # ac_fn_c_check_type
>  
> @@ -1983,7 +2012,7 @@
>    as_lineno=${as_lineno-"$1"} 
> as_lineno_stack=as_lineno_stack=$as_lineno_stack
>    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for uint$2_t" >&5
>  $as_echo_n "checking for uint$2_t... " >&6; }
> -if { as_var=$3; eval "test \"\${$as_var+set}\" = set"; }; then :
> +if eval \${$3+:} false; then :
>    $as_echo_n "(cached) " >&6
>  else
>    eval "$3=no"
> @@ -1998,7 +2027,8 @@
>  main ()
>  {
>  static int test_array [1 - 2 * !((($ac_type) -1 >> ($2 / 2 - 1)) >> ($2 / 2 
> - 1) == 3)];
> -test_array [0] = 0
> +test_array [0] = 0;
> +return test_array [0];
>  
>    ;
>    return 0;
> @@ -2013,8 +2043,7 @@
>  esac
>  fi
>  rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
> -       eval as_val=\$$3
> -   if test "x$as_val" = x""no; then :
> +       if eval test \"x\$"$3"\" = x"no"; then :
>  
>  else
>    break
> @@ -2024,7 +2053,7 @@
>  eval ac_res=\$$3
>              { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
>  $as_echo "$ac_res" >&6; }
> -  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset 
> as_lineno;}
> +  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
>  
>  } # ac_fn_c_find_uintX_t
>  
> @@ -2045,7 +2074,8 @@
>  main ()
>  {
>  static int test_array [1 - 2 * !(($2) >= 0)];
> -test_array [0] = 0
> +test_array [0] = 0;
> +return test_array [0];
>  
>    ;
>    return 0;
> @@ -2061,7 +2091,8 @@
>  main ()
>  {
>  static int test_array [1 - 2 * !(($2) <= $ac_mid)];
> -test_array [0] = 0
> +test_array [0] = 0;
> +return test_array [0];
>  
>    ;
>    return 0;
> @@ -2087,7 +2118,8 @@
>  main ()
>  {
>  static int test_array [1 - 2 * !(($2) < 0)];
> -test_array [0] = 0
> +test_array [0] = 0;
> +return test_array [0];
>  
>    ;
>    return 0;
> @@ -2103,7 +2135,8 @@
>  main ()
>  {
>  static int test_array [1 - 2 * !(($2) >= $ac_mid)];
> -test_array [0] = 0
> +test_array [0] = 0;
> +return test_array [0];
>  
>    ;
>    return 0;
> @@ -2137,7 +2170,8 @@
>  main ()
>  {
>  static int test_array [1 - 2 * !(($2) <= $ac_mid)];
> -test_array [0] = 0
> +test_array [0] = 0;
> +return test_array [0];
>  
>    ;
>    return 0;
> @@ -2201,7 +2235,7 @@
>  rm -f conftest.val
>  
>    fi
> -  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset 
> as_lineno;}
> +  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
>    as_fn_set_status $ac_retval
>  
>  } # ac_fn_c_compute_int
> @@ -2210,7 +2244,7 @@
>  running configure, to aid debugging if configure makes a mistake.
>  
>  It was created by $as_me, which was
> -generated by GNU Autoconf 2.65.  Invocation command line was
> +generated by GNU Autoconf 2.69.  Invocation command line was
>  
>    $ $0 $@
>  
> @@ -2320,11 +2354,9 @@
>    {
>      echo
>  
> -    cat <<\_ASBOX
> -## ---------------- ##
> +    $as_echo "## ---------------- ##
>  ## Cache variables. ##
> -## ---------------- ##
> -_ASBOX
> +## ---------------- ##"
>      echo
>      # The following way of writing the cache mishandles newlines in values,
>  (
> @@ -2358,11 +2390,9 @@
>  )
>      echo
>  
> -    cat <<\_ASBOX
> -## ----------------- ##
> +    $as_echo "## ----------------- ##
>  ## Output variables. ##
> -## ----------------- ##
> -_ASBOX
> +## ----------------- ##"
>      echo
>      for ac_var in $ac_subst_vars
>      do
> @@ -2375,11 +2405,9 @@
>      echo
>  
>      if test -n "$ac_subst_files"; then
> -      cat <<\_ASBOX
> -## ------------------- ##
> +      $as_echo "## ------------------- ##
>  ## File substitutions. ##
> -## ------------------- ##
> -_ASBOX
> +## ------------------- ##"
>        echo
>        for ac_var in $ac_subst_files
>        do
> @@ -2393,11 +2421,9 @@
>      fi
>  
>      if test -s confdefs.h; then
> -      cat <<\_ASBOX
> -## ----------- ##
> +      $as_echo "## ----------- ##
>  ## confdefs.h. ##
> -## ----------- ##
> -_ASBOX
> +## ----------- ##"
>        echo
>        cat confdefs.h
>        echo
> @@ -2452,7 +2478,12 @@
>  ac_site_file1=NONE
>  ac_site_file2=NONE
>  if test -n "$CONFIG_SITE"; then
> -  ac_site_file1=$CONFIG_SITE
> +  # We do not want a PATH search for config.site.
> +  case $CONFIG_SITE in #((
> +    -*)  ac_site_file1=./$CONFIG_SITE;;
> +    */*) ac_site_file1=$CONFIG_SITE;;
> +    *)   ac_site_file1=./$CONFIG_SITE;;
> +  esac
>  elif test "x$prefix" != xNONE; then
>    ac_site_file1=$prefix/share/config.site
>    ac_site_file2=$prefix/etc/config.site
> @@ -2467,7 +2498,11 @@
>      { $as_echo "$as_me:${as_lineno-$LINENO}: loading site script 
> $ac_site_file" >&5
>  $as_echo "$as_me: loading site script $ac_site_file" >&6;}
>      sed 's/^/| /' "$ac_site_file" >&5
> -    . "$ac_site_file"
> +    . "$ac_site_file" \
> +      || { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" 
> >&5
> +$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
> +as_fn_error $? "failed to load site script $ac_site_file
> +See \`config.log' for more details" "$LINENO" 5; }
>    fi
>  done
>  
> @@ -2543,7 +2578,7 @@
>  $as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
>    { $as_echo "$as_me:${as_lineno-$LINENO}: error: changes in the environment 
> can compromise the build" >&5
>  $as_echo "$as_me: error: changes in the environment can compromise the 
> build" >&2;}
> -  as_fn_error "run \`make distclean' and/or \`rm $cache_file' and start 
> over" "$LINENO" 5
> +  as_fn_error $? "run \`make distclean' and/or \`rm $cache_file' and start 
> over" "$LINENO" 5
>  fi
>  ## -------------------- ##
>  ## Main body of script. ##
> @@ -2565,7 +2600,7 @@
>  $as_echo_n "checking whether ${MAKE-make} sets \$(MAKE)... " >&6; }
>  set x ${MAKE-make}
>  ac_make=`$as_echo "$2" | sed 's/+/p/g; s/[^a-zA-Z0-9_]/_/g'`
> -if { as_var=ac_cv_prog_make_${ac_make}_set; eval "test \"\${$as_var+set}\" = 
> set"; }; then :
> +if eval \${ac_cv_prog_make_${ac_make}_set+:} false; then :
>    $as_echo_n "(cached) " >&6
>  else
>    cat >conftest.make <<\_ACEOF
> @@ -2573,7 +2608,7 @@
>  all:
>       @echo '@@@%%%=$(MAKE)=@@@%%%'
>  _ACEOF
> -# GNU make sometimes prints "make[1]: Entering...", which would confuse us.
> +# GNU make sometimes prints "make[1]: Entering ...", which would confuse us.
>  case `${MAKE-make} -f conftest.make 2>/dev/null` in
>    *@@@%%%=?*=@@@%%%*)
>      eval ac_cv_prog_make_${ac_make}_set=yes;;
> @@ -2603,7 +2638,7 @@
>  set dummy ${ac_tool_prefix}gcc; ac_word=$2
>  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
>  $as_echo_n "checking for $ac_word... " >&6; }
> -if test "${ac_cv_prog_CC+set}" = set; then :
> +if ${ac_cv_prog_CC+:} false; then :
>    $as_echo_n "(cached) " >&6
>  else
>    if test -n "$CC"; then
> @@ -2615,7 +2650,7 @@
>    IFS=$as_save_IFS
>    test -z "$as_dir" && as_dir=.
>      for ac_exec_ext in '' $ac_executable_extensions; do
> -  if { test -f "$as_dir/$ac_word$ac_exec_ext" && $as_test_x 
> "$as_dir/$ac_word$ac_exec_ext"; }; then
> +  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
>      ac_cv_prog_CC="${ac_tool_prefix}gcc"
>      $as_echo "$as_me:${as_lineno-$LINENO}: found 
> $as_dir/$ac_word$ac_exec_ext" >&5
>      break 2
> @@ -2643,7 +2678,7 @@
>  set dummy gcc; ac_word=$2
>  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
>  $as_echo_n "checking for $ac_word... " >&6; }
> -if test "${ac_cv_prog_ac_ct_CC+set}" = set; then :
> +if ${ac_cv_prog_ac_ct_CC+:} false; then :
>    $as_echo_n "(cached) " >&6
>  else
>    if test -n "$ac_ct_CC"; then
> @@ -2655,7 +2690,7 @@
>    IFS=$as_save_IFS
>    test -z "$as_dir" && as_dir=.
>      for ac_exec_ext in '' $ac_executable_extensions; do
> -  if { test -f "$as_dir/$ac_word$ac_exec_ext" && $as_test_x 
> "$as_dir/$ac_word$ac_exec_ext"; }; then
> +  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
>      ac_cv_prog_ac_ct_CC="gcc"
>      $as_echo "$as_me:${as_lineno-$LINENO}: found 
> $as_dir/$ac_word$ac_exec_ext" >&5
>      break 2
> @@ -2696,7 +2731,7 @@
>  set dummy ${ac_tool_prefix}cc; ac_word=$2
>  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
>  $as_echo_n "checking for $ac_word... " >&6; }
> -if test "${ac_cv_prog_CC+set}" = set; then :
> +if ${ac_cv_prog_CC+:} false; then :
>    $as_echo_n "(cached) " >&6
>  else
>    if test -n "$CC"; then
> @@ -2708,7 +2743,7 @@
>    IFS=$as_save_IFS
>    test -z "$as_dir" && as_dir=.
>      for ac_exec_ext in '' $ac_executable_extensions; do
> -  if { test -f "$as_dir/$ac_word$ac_exec_ext" && $as_test_x 
> "$as_dir/$ac_word$ac_exec_ext"; }; then
> +  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
>      ac_cv_prog_CC="${ac_tool_prefix}cc"
>      $as_echo "$as_me:${as_lineno-$LINENO}: found 
> $as_dir/$ac_word$ac_exec_ext" >&5
>      break 2
> @@ -2736,7 +2771,7 @@
>  set dummy cc; ac_word=$2
>  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
>  $as_echo_n "checking for $ac_word... " >&6; }
> -if test "${ac_cv_prog_CC+set}" = set; then :
> +if ${ac_cv_prog_CC+:} false; then :
>    $as_echo_n "(cached) " >&6
>  else
>    if test -n "$CC"; then
> @@ -2749,7 +2784,7 @@
>    IFS=$as_save_IFS
>    test -z "$as_dir" && as_dir=.
>      for ac_exec_ext in '' $ac_executable_extensions; do
> -  if { test -f "$as_dir/$ac_word$ac_exec_ext" && $as_test_x 
> "$as_dir/$ac_word$ac_exec_ext"; }; then
> +  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
>      if test "$as_dir/$ac_word$ac_exec_ext" = "/usr/ucb/cc"; then
>         ac_prog_rejected=yes
>         continue
> @@ -2795,7 +2830,7 @@
>  set dummy $ac_tool_prefix$ac_prog; ac_word=$2
>  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
>  $as_echo_n "checking for $ac_word... " >&6; }
> -if test "${ac_cv_prog_CC+set}" = set; then :
> +if ${ac_cv_prog_CC+:} false; then :
>    $as_echo_n "(cached) " >&6
>  else
>    if test -n "$CC"; then
> @@ -2807,7 +2842,7 @@
>    IFS=$as_save_IFS
>    test -z "$as_dir" && as_dir=.
>      for ac_exec_ext in '' $ac_executable_extensions; do
> -  if { test -f "$as_dir/$ac_word$ac_exec_ext" && $as_test_x 
> "$as_dir/$ac_word$ac_exec_ext"; }; then
> +  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
>      ac_cv_prog_CC="$ac_tool_prefix$ac_prog"
>      $as_echo "$as_me:${as_lineno-$LINENO}: found 
> $as_dir/$ac_word$ac_exec_ext" >&5
>      break 2
> @@ -2839,7 +2874,7 @@
>  set dummy $ac_prog; ac_word=$2
>  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
>  $as_echo_n "checking for $ac_word... " >&6; }
> -if test "${ac_cv_prog_ac_ct_CC+set}" = set; then :
> +if ${ac_cv_prog_ac_ct_CC+:} false; then :
>    $as_echo_n "(cached) " >&6
>  else
>    if test -n "$ac_ct_CC"; then
> @@ -2851,7 +2886,7 @@
>    IFS=$as_save_IFS
>    test -z "$as_dir" && as_dir=.
>      for ac_exec_ext in '' $ac_executable_extensions; do
> -  if { test -f "$as_dir/$ac_word$ac_exec_ext" && $as_test_x 
> "$as_dir/$ac_word$ac_exec_ext"; }; then
> +  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
>      ac_cv_prog_ac_ct_CC="$ac_prog"
>      $as_echo "$as_me:${as_lineno-$LINENO}: found 
> $as_dir/$ac_word$ac_exec_ext" >&5
>      break 2
> @@ -2893,8 +2928,8 @@
>  
>  test -z "$CC" && { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in 
> \`$ac_pwd':" >&5
>  $as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
> -as_fn_error "no acceptable C compiler found in \$PATH
> -See \`config.log' for more details." "$LINENO" 5; }
> +as_fn_error $? "no acceptable C compiler found in \$PATH
> +See \`config.log' for more details" "$LINENO" 5; }
>  
>  # Provide some information about the compiler.
>  $as_echo "$as_me:${as_lineno-$LINENO}: checking for C compiler version" >&5
> @@ -3008,9 +3043,8 @@
>  
>  { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
>  $as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
> -{ as_fn_set_status 77
> -as_fn_error "C compiler cannot create executables
> -See \`config.log' for more details." "$LINENO" 5; }; }
> +as_fn_error 77 "C compiler cannot create executables
> +See \`config.log' for more details" "$LINENO" 5; }
>  else
>    { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
>  $as_echo "yes" >&6; }
> @@ -3052,8 +3086,8 @@
>  else
>    { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
>  $as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
> -as_fn_error "cannot compute suffix of executables: cannot compile and link
> -See \`config.log' for more details." "$LINENO" 5; }
> +as_fn_error $? "cannot compute suffix of executables: cannot compile and link
> +See \`config.log' for more details" "$LINENO" 5; }
>  fi
>  rm -f conftest conftest$ac_cv_exeext
>  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_exeext" >&5
> @@ -3110,9 +3144,9 @@
>      else
>       { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
>  $as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
> -as_fn_error "cannot run C compiled programs.
> +as_fn_error $? "cannot run C compiled programs.
>  If you meant to cross compile, use \`--host'.
> -See \`config.log' for more details." "$LINENO" 5; }
> +See \`config.log' for more details" "$LINENO" 5; }
>      fi
>    fi
>  fi
> @@ -3123,7 +3157,7 @@
>  ac_clean_files=$ac_clean_files_save
>  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for suffix of object 
> files" >&5
>  $as_echo_n "checking for suffix of object files... " >&6; }
> -if test "${ac_cv_objext+set}" = set; then :
> +if ${ac_cv_objext+:} false; then :
>    $as_echo_n "(cached) " >&6
>  else
>    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
> @@ -3163,8 +3197,8 @@
>  
>  { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
>  $as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
> -as_fn_error "cannot compute suffix of object files: cannot compile
> -See \`config.log' for more details." "$LINENO" 5; }
> +as_fn_error $? "cannot compute suffix of object files: cannot compile
> +See \`config.log' for more details" "$LINENO" 5; }
>  fi
>  rm -f conftest.$ac_cv_objext conftest.$ac_ext
>  fi
> @@ -3174,7 +3208,7 @@
>  ac_objext=$OBJEXT
>  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether we are using the 
> GNU C compiler" >&5
>  $as_echo_n "checking whether we are using the GNU C compiler... " >&6; }
> -if test "${ac_cv_c_compiler_gnu+set}" = set; then :
> +if ${ac_cv_c_compiler_gnu+:} false; then :
>    $as_echo_n "(cached) " >&6
>  else
>    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
> @@ -3211,7 +3245,7 @@
>  ac_save_CFLAGS=$CFLAGS
>  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC accepts -g" >&5
>  $as_echo_n "checking whether $CC accepts -g... " >&6; }
> -if test "${ac_cv_prog_cc_g+set}" = set; then :
> +if ${ac_cv_prog_cc_g+:} false; then :
>    $as_echo_n "(cached) " >&6
>  else
>    ac_save_c_werror_flag=$ac_c_werror_flag
> @@ -3289,7 +3323,7 @@
>  fi
>  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $CC option to accept 
> ISO C89" >&5
>  $as_echo_n "checking for $CC option to accept ISO C89... " >&6; }
> -if test "${ac_cv_prog_cc_c89+set}" = set; then :
> +if ${ac_cv_prog_cc_c89+:} false; then :
>    $as_echo_n "(cached) " >&6
>  else
>    ac_cv_prog_cc_c89=no
> @@ -3298,8 +3332,7 @@
>  /* end confdefs.h.  */
>  #include <stdarg.h>
>  #include <stdio.h>
> -#include <sys/types.h>
> -#include <sys/stat.h>
> +struct stat;
>  /* Most of the following tests are stolen from RCS 5.7's src/conf.sh.  */
>  struct buf { int x; };
>  FILE * (*rcsopen) (struct buf *, struct stat *, int);
> @@ -3395,7 +3428,7 @@
>    CPP=
>  fi
>  if test -z "$CPP"; then
> -  if test "${ac_cv_prog_CPP+set}" = set; then :
> +  if ${ac_cv_prog_CPP+:} false; then :
>    $as_echo_n "(cached) " >&6
>  else
>        # Double quotes because CPP needs to be expanded
> @@ -3425,7 +3458,7 @@
>    # Broken: fails on valid input.
>  continue
>  fi
> -rm -f conftest.err conftest.$ac_ext
> +rm -f conftest.err conftest.i conftest.$ac_ext
>  
>    # OK, works on sane cases.  Now check whether nonexistent headers
>    # can be detected and how.
> @@ -3441,11 +3474,11 @@
>  ac_preproc_ok=:
>  break
>  fi
> -rm -f conftest.err conftest.$ac_ext
> +rm -f conftest.err conftest.i conftest.$ac_ext
>  
>  done
>  # Because of `break', _AC_PREPROC_IFELSE's cleaning code was skipped.
> -rm -f conftest.err conftest.$ac_ext
> +rm -f conftest.i conftest.err conftest.$ac_ext
>  if $ac_preproc_ok; then :
>    break
>  fi
> @@ -3484,7 +3517,7 @@
>    # Broken: fails on valid input.
>  continue
>  fi
> -rm -f conftest.err conftest.$ac_ext
> +rm -f conftest.err conftest.i conftest.$ac_ext
>  
>    # OK, works on sane cases.  Now check whether nonexistent headers
>    # can be detected and how.
> @@ -3500,18 +3533,18 @@
>  ac_preproc_ok=:
>  break
>  fi
> -rm -f conftest.err conftest.$ac_ext
> +rm -f conftest.err conftest.i conftest.$ac_ext
>  
>  done
>  # Because of `break', _AC_PREPROC_IFELSE's cleaning code was skipped.
> -rm -f conftest.err conftest.$ac_ext
> +rm -f conftest.i conftest.err conftest.$ac_ext
>  if $ac_preproc_ok; then :
>  
>  else
>    { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
>  $as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
> -as_fn_error "C preprocessor \"$CPP\" fails sanity check
> -See \`config.log' for more details." "$LINENO" 5; }
> +as_fn_error $? "C preprocessor \"$CPP\" fails sanity check
> +See \`config.log' for more details" "$LINENO" 5; }
>  fi
>  
>  ac_ext=c
> @@ -3523,7 +3556,7 @@
>  
>  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for grep that handles long 
> lines and -e" >&5
>  $as_echo_n "checking for grep that handles long lines and -e... " >&6; }
> -if test "${ac_cv_path_GREP+set}" = set; then :
> +if ${ac_cv_path_GREP+:} false; then :
>    $as_echo_n "(cached) " >&6
>  else
>    if test -z "$GREP"; then
> @@ -3537,7 +3570,7 @@
>      for ac_prog in grep ggrep; do
>      for ac_exec_ext in '' $ac_executable_extensions; do
>        ac_path_GREP="$as_dir/$ac_prog$ac_exec_ext"
> -      { test -f "$ac_path_GREP" && $as_test_x "$ac_path_GREP"; } || continue
> +      as_fn_executable_p "$ac_path_GREP" || continue
>  # Check for GNU ac_path_GREP and sel...

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