Running a script during port build

[Conrad J. Sabatier]

I'm trying to get a script to run as part of an update to
games/gnuchess (to optionally create the opening book for gnuchess). 
I've placed the script under games/gnuchess/scripts as "pre-install",
but it never seems to be getting invoked.

Has the use of a scripts dir for ports been deprecated?  If not, what
does it take to get the script to actually be run?

Thanks.

-- 
Conrad J. Sabatier <conrads at cox.net> -- "In Unix veritas"