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|worker|prefork|mpmt_os2|perchild|leader|threadpool}),[  APACHE_MPM=$withval],[  if test "x$APACHE_MPM" = "x"; then    APACHE_MPM=prefork  fi])AC_MSG_RESULT($APACHE_MPM)apache_cv_mpm=$APACHE_MPM	if test "$apache_cv_mpm" = "worker" -o "$apache_cv_mpm" = "perchild" -o "$apache_cv_mpm" = "leader" -o "$apache_cv_mpm" = "threadpool" ; then  APR_CHECK_APR_DEFINE(APR_HAS_THREADS)  if test "x$ac_cv_define_APR_HAS_THREADS" = "xno"; then    AC_MSG_RESULT(The currently selected MPM requires threads which your system seems to lack)    AC_MSG_CHECKING(checking for replacement)    AC_MSG_RESULT(prefork selected)    apache_cv_mpm=prefork  fifiAPACHE_FAST_OUTPUT(server/mpm/Makefile)MPM_NAME=$apache_cv_mpmif test "$MPM_NAME" = "leader" -o "$MPM_NAME" = "threadpool" -o "$MPM_NAME" = "perchild"; then  AC_MSG_WARN(You have selected an EXPERIMENTAL MPM.  Be warned!)  MPM_SUBDIR_NAME=experimental/$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}"