# PRELUDE
 AC_ARG_ENABLE(prelude,
               AS_HELP_STRING([--enable-prelude],
                              [Enable Prelude support for alerts.]),
 [
   if test "$enableval" != "no"; then
     AM_PATH_LIBPRELUDE(0.9.9, , AC_MSG_ERROR(Cannot find libprelude: Is libprelude-config in the path?), no)
     CPPFLAGS="${CPPFLAGS} ${LIBPRELUDE_CFLAGS}"
     LDFLAGS="${LDFLAGS} ${LIBPRELUDE_LDFLAGS}"
     LDFLAGS="${LDFLAGS} ${LIBPRELUDE_LIBS}"
     AC_DEFINE([PRELUDE], [1], [Libprelude support enabled])
   fi
 ],)