On my system, running with the -v switch produces:

Insecure $ENV{PATH} while running with -T switch at /usr/lib/perl5/sit
+e_perl/5.8.0/GnuPG/Interface.pm line 322.
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On my system, gpg is in /usr/bin, so

$ENV{PATH} = '/usr/bin';
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gets past this.

--Bob Niederman, http://bob-n.com