AC_DEFUN([LFTP_PTY_CHECK],[
case "$host" in
*-*-linux*)	no_dev_ptmx=1; no_dev_ptc=1;;
*-*-sco3.2v4*)	no_dev_ptmx=1;;
*-*-sco3.2v5*)	no_dev_ptmx=1;;
esac
if test -z "$no_dev_ptmx" ; then
   AC_CHECK_FILE("/dev/ptmx", [
      AC_DEFINE(HAVE_DEV_PTMX,1,[define if you have /dev/ptmx device])])
fi
if test -z "$no_dev_ptc" ; then
   AC_CHECK_FILE("/dev/ptc", [
      AC_DEFINE(HAVE_DEV_PTS_AND_PTC,1,[define if you have /dev/ptc device])])
fi
AC_CHECK_HEADERS([util.h sys/stropts.h pty.h])
AC_SEARCH_LIBS(openpty,util,
   [AC_DEFINE(HAVE_OPENPTY,1,[define if you have openpty function])])
AC_CHECK_FUNCS([_getpty])
])