Problem compiling PERL

i'm using RedHat 7.0, with postgres 7.0.3
after I execute:
% perl Makefile.PL
I try to execute the make command and this if what i get
[jruiz@dns perl5]$ make
gcc -c -I../libpq -I../../include -fno-strict-aliasing -O2 -march=i386 -mcpu
=i686     -DVERSION=\"1.8.0\" -DXS_VERSION=\"1.8.0\" -fPIC -I/usr/lib/perl5/
5.6.0/i386-linux/CORE  Pg.c
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: *** [Pg.o] Error 1
if anyone can help me i'll appreciate it