Problem building on Solaris 2.7

[Mod-Perl List]

I am trying to build mod_perl 1.25 as a DSO on Solaris 2.7
and when I execute perl Makefile.PL, it says I will probably
get core dumps and to upgrade to perl 5.6. I am running
Perl 5.005_03, the latest considered stable on Solaris 2.7. I
cannot upgrade to 5.6 due to heavy perl code already on this
machine.

Can anyone point me in the right direction?

Thanks,
CC