[AC_MSG_ERROR(a required header file cannot be found.)])
AC_CHECK_LIB(fcgi, FCGI_Accept, [],
[AC_MSG_ERROR(cannot find libfcgi.)])
AC_CHECK_LIB(rrd_th, rrd_graph_v, [],
[AC_MSG_ERROR(cannot find librrd_th.)], [-lm])
[AC_MSG_ERROR(a required header file cannot be found.)])
AC_CHECK_LIB(fcgi, FCGI_Accept, [],
[AC_MSG_ERROR(cannot find libfcgi.)])
AC_CHECK_LIB(rrd_th, rrd_graph_v, [],
[AC_MSG_ERROR(cannot find librrd_th.)], [-lm])