Milter-greylist

> Here is 4.0 alpha3:
> http://ftp.espci.fr/pub/milter-greylist/milter-greylist-4.0a3.tgz
> MD5 (milter-greylist-4.0a3.tgz) = 76708dda6c3414321d4147e6274a7563
> 
> From ChangeLog:
>         Add an urlcheck reply which is ignored: milterGreylistIgnore 
> 	Build fixes for Debian (Bernhard Schneider)
> 	Add a configure flag to not use --rpath (Bernhard Schneider)
> 	Cleanup stale PID file on startup (Bernhard Schneider)
> 	Fix memory leak with DNSRBL (Michael Fromme)
> 

Hello,

I get now this error message at configure stage on version 4.0a3:

flex: unknown flag '-'.  For usage, try
        flex --help
configure: error: flex missing yypop_buffer_state - upgrade to version 2.5.33 or
 later

Is this change expected?

Bests,
Attila