Upating Tcl/Tk installation breaks Tkx?

I have recently done a minor version rev of my Tk installation (from 
8.5.12 to 8.5.13) and now I can't run my Perl Tkx script. It fails with 
this error message:

Kevin-Walzers-MacBook-5:stringdrill-2 kevin$  macperl stringdrill.pl
attempt to provide package Tk 8.5.12 failed: package Tk 8.5.13 provided 
instead at stringdrill.pl line 3.

How can I solve this problem? It doesn't appear that 
rebuilding/reinstalling Tkx is necessary as cpan tells me my 
installation is up-to-date. Is there a way to specify the required 
version of Tk in my Perl script?

-- 
Kevin Walzer
Code by Kevin/Mobile Code by Kevin
http://www.codebykevin.com
http://www.wtmobilesoftware.com