From the INSTALL file:
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fwsnort requires two perl modules in order to run properly:

IPTables::Parse
NetAddr::IP

These two modules are bundled with fwsnort within the deps/ directory, unless
you have downloaded the fwsnort-nodeps tarball, in which case these two
modules need to be installed in the perl library tree.
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perl-NetAddr-IP is already shipping the later, and I just packaged perl-IPTables-Parse.

Can you update the package to use the -nodeps tarball instead of the full blown one? (that is, http://www.cipherdyne.org/fwsnort/download/fwsnort-nodeps-1.6.4.tar.gz instead of http://www.cipherdyne.org/fwsnort/download/fwsnort-1.6.4.tar.bz2)
(Note: let's do that in cauldron only, no need to backport this change)

Then, you can add the following BuildRequires / Requires: perl(IPTables::Parse) and perl(NetAddr::IP)

If there are future needs, just ping me so I can add the wanted modules.