Hey, pkg guys

I'm currrently run into a problem that after I bmake the 
chat/irssi on Solaris 10 and it coredumped at startup.
so I want to compile a debug version to dig into it. 

would you please tell me if there any command to make this
done, like "bmake install -DDEBUG=yes"?

I checked pkgsrc guide but with no luck.

Any pointer appreciated.

-Huajian.