An updated Perl packages has been released which uses a more logical INC-path, the same as RHEL uses.

@INC:
/opt/csw/lib/perl/site_perl
/opt/csw/share/perl/site_perl
/opt/csw/share/perl/site_perl
/opt/csw/lib/perl/csw
/opt/csw/share/perl/csw
/opt/csw/share/perl/csw
/opt/csw/lib/perl/5.10.1
/opt/csw/share/perl/5.10.1
.