buildable interface testers error

[Kevin Ryde <user42 zip com au>]

I got a cpan testers report about failing Gtk2::Buildable interface,
http://www.nntp.perl.org/group/perl.cpan.testers/2008/09/msg2285035.html

    [ERROR] [Wed Sep 24 01:06:07 2008] MAKE TEST failed: Illegal seek PERL_DL_NONLAZY=1 
/export/home/cpan/pit/rel/perl5.10.0/bin/perl "-MExtUtils::Command::MM" "-e" "test_harness(0, 'blib/lib', 
'blib/arch')" t/*.t

    t/TickerView....Can't locate object method "_ADD_INTERFACE" via package "Gtk2::Buildable" (perhaps you 
forgot to load "Gtk2::Buildable"?) at 
/export/home/cpan/pit/rel/perl5.10.0/.cpanplus/5.10.0/build/Glib-1.200/blib/lib/Glib/Object/Subclass.pm line 
225.
    BEGIN failed--compilation aborted at 
/export/home/cpan/pit/rel/perl5.10.0/.cpanplus/5.10.0/build/Gtk2-Ex-TickerView-8/blib/lib/Gtk2/Ex/TickerView.pm
 line 98.

the operative bit of code is pretty simple,

...
use Gtk2 1.180;
...
use base 'Gtk2::Ex::CellLayout::Base';
...
use Glib::Object::Subclass
  Gtk2::DrawingArea::,
  interfaces => [ 'Gtk2::CellLayout', 'Gtk2::Buildable' ],
  ...

The actual buildable funcs come from my "CellLayout::Base", but I don't
think it's reached the stage of wanting them.  Is there anything likely
I might be doing wrong?  It works fine for me, but not apparently on
this solaris.  Does anyone have the misfortune to be using an i386
solaris?  It failed in a similar way on an i386 gnu a while back too,
but I assumed it got better by itself, or something.
http://www.nntp.perl.org/group/perl.cpan.testers/2008/06/msg1693751.html