find port install options

[Robin Becker]

Is it possible to determine what options were used during port installation. One 
of the recipes I'm trying to follow calls for perl to be installed with 
USE_THREADS=yes.

pkg_info | grep perl produces

perl-5.8.8          Practical Extraction and Report Language

but that doesn't tell me how it was installed. Trawling through the masses of 
port reated docs doesn't give me an obvious answer either and make.conf contains 
only

PERL_VER=5.8.8
PERL_VERSION=5.8.8


I suppose its safest to assume that I need to reinstall perl, but how easy is it 
to do that? I think it was installed by default.
-- 
Robin Becker