Build7.0.2 with perl Pg.pm fails

I am trying to install Postgresql7.0.2 with perl support
for Pg.pm . I ran configure --with-perl OK, but during the
make it fails with:

Pg.xs: In function `XS_Pg_PQprint':
Pg.xs:584: `na' undeclared (first use in this function)
Pg.xs:584: (Each undeclared identifier is reported only once
Pg.xs:584: for each function it appears in.)
Pg.xs: In function `XS_PG_results_fetchrow':
Pg.xs:1255: `sv_undef' undeclared (first use in this function)
Pg.xs: In function `XS_PG_results_print':
Pg.xs:1295: `na' undeclared (first use in this function)
make[2]: *** [Pg.o] Error 1
make[1]: *** [all] Error 2
make: *** [all] Error 2
This is on RedHat 6.2 2.2.14-5.0 with perl 5.6.0
(Without perl it builds and installs fine.)

Any help appreciated.

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