ac_set_default_paths_system

the most interesting changes go about windows-targets - where the default_prefix is set to /programs, and quite some directories are aliased: sbindir := libdir := bindir and the docprefix-defaults are also a bit different, even on FHS2-compliant systems where the mandir is going to $prefix/man only if prefix=/usr, otherwise they shall go to $datadir/man. We use an extra docprefix to express it which is either defined as being prefix or datadir. not SUBSTed here.

AC_DEFUN([AC_SET_DEFAULT_PATHS_SYSTEM],
[AC_REQUIRE([AC_CANONICAL_HOST]) # --------------------------------------------
case "$prefix:$ac_default_prefix" in
  NONE:/usr/local)
    result=""
    AC_MSG_CHECKING(default prefix path)
    case "${target_os}" in
      *cygwin* | *mingw* | *uwin* | *djgpp | *emx* )
        if test "${host_os}" = "${target_os}" ; then
           ac_default_prefix="/programs"
           result="(win/dos target)"
        else
           case "$PATH" in
              *:/usr/local/cross-tools/$target_alias/bin:*)
                  ac_default_prefix="/usr/local/cross-tools/$target_alias" ;;
              *:/usr/local/$target_alias/bin:*)
                  ac_default_prefix="/usr/local/$target_alias" ;;
              *:/usr/local/$target_cpu-$target_os/bin:*)
                  ac_default_prefix="/usr/local/$target_cpu-$target_os" ;;
              *)
                  ac_default_prefix="/programs" ;;
           esac
           result="(win/dos cross-compiler)"
        fi
    ;;
    esac
    AC_MSG_RESULT($ac_default_prefix $result)
  ;;
esac
AC_MSG_CHECKING(default prefix system)
result="$prefix" ; test "$result" = "NONE" && result="$ac_default_prefix"
case ${result} in
  /programs | /programs/*) result="is win-/programs"
     # on win/dos, .exe .dll and .cfg live in the same directory
     libdir=`echo $libdir |sed -e 's:^..exec_prefix./lib$:${bindir}:'`
     sbindir=`echo $sbindir |sed -e 's:^..exec_prefix./sbin$:${libdir}:'`
     sysconfdir=`echo $sysconfdir |sed -e 's:^..prefix./etc$:${sbindir}:'`
     libexecdir=`echo $libexecdir |sed -e 's:/libexec$:/system:'`
     # help-files shall be set with --infodir, docprefix is datadir
     docprefix="${datadir}"
     mandir=`echo $mandir \
                             |sed -e 's:^..prefix./man$:${datadir}/info:'`
     includedir=`echo $includedir \
                |sed -e 's:^..prefix./include$:${datadir}/include:'`
     # other state files (but /etc) are moved to datadir
     sharedstatedir=`echo $sharedstatedir \
                     |sed -e 's:^..prefix./com$:${datadir}/default:'`
     localstatedir=`echo $localstatedir \
                     |sed -e 's:^..prefix./var$:${datadir}/current:'`
  ;;
  /usr) result="is /usr-shipped"
     # doc files are left at prefix
     docprefix="${prefix}"
     # state files go under /top
     sysconfdir=`echo $sysconfdir |sed -e 's:^..prefix./etc$:/etc:'`
     sharedstatedir=`echo $sharedstatedir \
                     |sed -e 's:^..prefix./com$:/etc/default:'`
     # $prefix/var is going to end up in /var/lib
     localstatedir=`echo $localstatedir \
                     |sed -e 's:^..prefix./var$:/var/lib:'`
  ;;
  /opt | /opt/*) result="is /opt-package"
     # state files go under /top/prefix
     sysconfdir=`echo $sysconfdir \
                     |sed -e 's:^..prefix./etc$:/etc${prefix}:'`
     sharedstatedir=`echo $sharedstatedir \
                     |sed -e 's:^..prefix./com$:/etc/default${prefix}:'`
     # $prefix/var is going to to be /var$prefix... once again
     localstatedir=`echo $localstatedir \
                     |sed -e 's:^..prefix./var$:/var${prefix}:'`
     # doc files are left at prefix
     docprefix="${prefix}"
  ;;
  *) result="is /local-package"
     # doc files are moved from prefix down to datadir
     docprefix="${datadir}"
     mandir=`echo $mandir \
                     |sed -e 's:^..prefix./man$:${datadir}/man:'`
     infodir=`echo $infodir \
                     |sed -e 's:^..prefix./infodir$:${datadir}/info:'`
     # never use $prefix/com - that is no good idea
     sharedstatedir=`echo $sharedstatedir \
                     |sed -e 's:^..prefix./com$:${sysconfdir}/default:'`
  ;;
esac
AC_MSG_RESULT($result)
# --------------------------------------------------------
])

Copyright © 2006 Guido U. Draheim <guidod@gmx.de>

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

As a special exception, the respective Autoconf Macro's copyright owner gives unlimited permission to copy, distribute and modify the configure scripts that are the output of Autoconf when processing the Macro. You need not follow the terms of the GNU General Public License when using or distributing such scripts, even though portions of the text of the Macro appear in them. The GNU General Public License (GPL) does govern all other use of the material that constitutes the Autoconf Macro.

This special exception to the GPL applies to versions of the Autoconf Macro released by the Autoconf Macro Archive. When you make and distribute a modified version of the Autoconf Macro, you may extend this special exception to the GPL to apply to your modified version as well.