[Bioperl-l] Bio::TreeIO rises error "Weak references are not implemented in the version of perl"

[Daniel Gerlach]

Hello,

Trying to run Bio::TreeIO by this command:

perl -e 'use Bio::TreeIO'

I get the following error:

Weak references are not implemented in the version of perl at 
/usr/lib/perl5/site_perl/5.8.8/Bio/Tree/Node.pm line 76
BEGIN failed--compilation aborted at 
/usr/lib/perl5/site_perl/5.8.8/Bio/Tree/Node.pm line 76.
Compilation failed in require at 
/usr/lib/perl5/site_perl/5.8.8/Bio/TreeIO/TreeEventBuilder.pm line 65.
BEGIN failed--compilation aborted at 
/usr/lib/perl5/site_perl/5.8.8/Bio/TreeIO/TreeEventBuilder.pm line 65.
Compilation failed in require at 
/usr/lib/perl5/site_perl/5.8.8/Bio/TreeIO.pm line 77.
BEGIN failed--compilation aborted at 
/usr/lib/perl5/site_perl/5.8.8/Bio/TreeIO.pm line 77.
Compilation failed in require at -e line 1.
BEGIN failed--compilation aborted at -e line 1.

I am running perl v5.8.8 on Fedora 8 on a 64bit machine. I installed a 
recent version of bioperl around 5 month ago. Any suggestions of why 
this module can't be loaded correctly?

Greetings, Daniel