weirdness with CPAN modules that use Data::Dumper




I've got a CPAN module I've written that has Data::Dumper
listed in PREREQ_PM, because it has some tests that use it.
These tests are failing with this odd message:

t/relate...........Can't load '/home/david/cpantesting/perl-5.8.8/lib/5.8.8/i686-linux/auto/Data/Dumper/Dumper.so' for module Data::Dumper: /home/david/cpantesting/perl-5.8.8/lib/5.8.8/i686-linux/auto/Data/Dumper/Dumper.so: undefined symbol: PL_sv_undef at /home/david/cpantesting/perl-5.8.8/lib/5.8.8/i686-linux/XSLoader.pm line 70.
at /home/david/cpantesting/perl-5.8.8/lib/5.8.8/i686-linux/Data/Dumper.pm line 36
Compilation failed in require at /home/david/_/_/perl-5.8.8/.cpan/build/App-Relate-0.03-4hkFGt/t/../relate line 44.

Any clues as to what this might be about?

.