AC_MSG_CHECKING(which MPM to use)AC_ARG_WITH(mpm,APACHE_HELP_STRING(--with-mpm=MPM,Choose the process model for Apache to use.                          MPM={beos|event|worker|prefork|mpmt_os2}),[  APACHE_MPM=$withval],[  if test "x$APACHE_MPM" = "x"; then    APACHE_MPM=prefork  fi])AC_MSG_RESULT($APACHE_MPM)apache_cv_mpm=$APACHE_MPM	ap_mpm_is_threaded (){    if test "$apache_cv_mpm" = "worker" -o "$apache_cv_mpm" = "event" ; then        return 0    else        return 1    fi}ap_mpm_is_experimental (){    if test "$apache_cv_mpm" = "event" ; then        return 0    else        return 1    fi}if ap_mpm_is_threaded; then  APR_CHECK_APR_DEFINE(APR_HAS_THREADS)  if test "x$ac_cv_define_APR_HAS_THREADS" = "xno"; then    AC_MSG_RESULT(The currently selected MPM requires threads which your system seems to lack)    AC_MSG_CHECKING(checking for replacement)    AC_MSG_RESULT(prefork selected)    apache_cv_mpm=prefork  else    case $host in      *-linux-*)        case `uname -r` in          2.0* )            dnl Threaded MPM's are not supported on Linux 2.0            dnl as on 2.0 the linuxthreads library uses SIGUSR1            dnl and SIGUSR2 internally            echo "Threaded MPM's are not supported on this platform"            AC_MSG_CHECKING(checking for replacement)            AC_MSG_RESULT(prefork selected)            apache_cv_mpm=prefork          ;;        esac      ;;    esac  fifiAPACHE_FAST_OUTPUT(server/mpm/Makefile)MPM_NAME=$apache_cv_mpmif ap_mpm_is_experimental; then  AC_MSG_WARN(You have selected an EXPERIMENTAL MPM.  Be warned!)  MPM_SUBDIR_NAME=experimental/$MPM_NAMEelse  MPM_SUBDIR_NAME=$MPM_NAMEfiMPM_DIR=server/mpm/$MPM_SUBDIR_NAMEMPM_LIB=$MPM_DIR/lib${MPM_NAME}.laif test ! -f "$abs_srcdir/$MPM_DIR/mpm.h"; then    AC_MSG_ERROR(the selected mpm -- $apache_cv_mpm -- is not supported)fiAPACHE_SUBST(MPM_NAME)APACHE_SUBST(MPM_SUBDIR_NAME)MODLIST="$MODLIST mpm_${MPM_NAME}"