dnl @synopsis AC_PROG_APACHE([version])
dnl
dnl This macro searches for an installed apache server. If nothing was
dnl specified when calling configure or just --with-apache, it searches
dnl in
dnl /usr/local/apache/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin
dnl The argument of --with-apache specifies the full pathname of the
dnl httpd argument. For instance --with-apache=/usr/sbin/httpd.
dnl
dnl If the version argument is given, AC_PROG_APACHE checks that the
dnl apache server is this version number or higher.
dnl
dnl If the apache server is not found, abort configuration with error
dnl message.
dnl
dnl It defines the symbol APACHE if the server is found.
dnl
dnl Files using apache should do the following:
dnl
dnl   @APACHE@ -d /etc/httpd
dnl
dnl It defines the symbol APACHE_MODULES if a directory containing
dnl mod_env.* is found in the default server root directory (obtained
dnl with httpd -V).
dnl
dnl The httpd.conf file listing modules to be loaded dynamicaly can use
dnl @APACHE_MODULES@ to grab them in the appropriate sub directory. For
dnl instance:
dnl
dnl  ...
dnl  <IfModule mod_so.c>
dnl  LoadModule env_module         @APACHE_MODULES@/mod_env.so
dnl  LoadModule config_log_module  @APACHE_MODULES@/mod_log_config.so
dnl  ...
dnl
dnl @category InstalledPackages
dnl @author Loic Dachary <loic@senga.org>
dnl @version 2000-07-19
dnl @license GPLWithACException

AC_DEFUN([AC_PROG_APACHE],
#
# Handle user hints
#
[
 AC_MSG_CHECKING(if apache is wanted)
 AC_ARG_WITH(apache,
  [  --with-apache=PATH absolute path name of apache server (default is to search httpd in
    /usr/local/apache/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin),
    --without-apache to disable apache detection],
  [
    #
    # Run this if -with or -without was specified
    #
    if test "$withval" != no ; then
       AC_MSG_RESULT(yes)
       APACHE_WANTED=yes
       if test "$withval" != yes ; then
         APACHE="$withval"
       fi
    else
       APACHE_WANTED=no
       AC_MSG_RESULT(no)
    fi
  ], [
    #
    # Run this if nothing was said
    #
    APACHE_WANTED=yes
    AC_MSG_RESULT(yes)
  ])
  #
  # Now we know if we want apache or not, only go further if
  # it's wanted.
  #
  if test $APACHE_WANTED = yes ; then
    #
    # If not specified by caller, search in standard places
    #
    if test -z "$APACHE" ; then
      AC_PATH_PROG(APACHE, httpd, , /usr/local/apache/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin)
    fi
    AC_SUBST(APACHE)
    if test -z "$APACHE" ; then
        AC_MSG_ERROR("apache server executable not found");
    fi
    #
    # Collect apache version number. If for nothing else, this
    # guaranties that httpd is a working apache executable.
    #
    changequote(<<, >>)dnl
    APACHE_READABLE_VERSION=`$APACHE -v | grep 'Server version' | sed -e 's;.*Apache/\([0-9\.][0-9\.]*\).*;\1;'`
    changequote([, ])dnl
    APACHE_VERSION=`echo $APACHE_READABLE_VERSION | sed -e 's/\.//g'`
    if test -z "$APACHE_VERSION" ; then
        AC_MSG_ERROR("could not determine apache version number");
    fi
    APACHE_MAJOR=`expr $APACHE_VERSION : '\(..\)'`
    APACHE_MINOR=`expr $APACHE_VERSION : '..\(.*\)'`
    #
    # Check that apache version matches requested version or above
    #
    if test -n "$1" ; then
      AC_MSG_CHECKING(apache version >= $1)
      APACHE_REQUEST=`echo $1 | sed -e 's/\.//g'`
      APACHE_REQUEST_MAJOR=`expr $APACHE_REQUEST : '\(..\)'`
      APACHE_REQUEST_MINOR=`expr $APACHE_REQUEST : '..\(.*\)'`
      if test "$APACHE_MAJOR" -lt "$APACHE_REQUEST_MAJOR" -o "$APACHE_MINOR" -lt "$APACHE_REQUEST_MINOR" ; then
        AC_MSG_RESULT(no)
        AC_MSG_ERROR(apache version is $APACHE_READABLE_VERSION)
      else
        AC_MSG_RESULT(yes)
      fi
    fi
    #
    # Find out if .so modules are in libexec/module.so or modules/module.so
    #
    HTTP_ROOT=`$APACHE -V | grep HTTPD_ROOT | sed -e 's/.*"\(.*\)"/\1/'`
    AC_MSG_CHECKING(apache modules)
    for dir in libexec modules
    do
      if test -f $HTTP_ROOT/$dir/mod_env.*
      then
        APACHE_MODULES=$dir
      fi
    done
    if test -z "$APACHE_MODULES"
    then
      AC_MSG_RESULT(not found)
    else
      AC_MSG_RESULT(in $HTTP_ROOT/$APACHE_MODULES)
    fi
    AC_SUBST(APACHE_MODULES)
  fi
])