Pg Error

I have been trying to load the latest Pg driver but continue to get
this message:

##################################################
cpan> install Pg
Running install for module Pg
Running make for M/ME/MERGL/pgsql_perl5-1.9.0.tar.gz
CPAN: Digest::MD5 loaded ok
Checksum for
/root/.cpan/sources/authors/id/M/ME/MERGL/pgsql_perl5-1.9.0.tar.gz ok
Scanning cache /root/.cpan/build for sizes
pgsql_perl5-1.9.0/
pgsql_perl5-1.9.0/eg/
pgsql_perl5-1.9.0/eg/ApachePg.pl
pgsql_perl5-1.9.0/eg/example.pl
pgsql_perl5-1.9.0/eg/lo_demo.pl
pgsql_perl5-1.9.0/Changes
pgsql_perl5-1.9.0/MANIFEST
pgsql_perl5-1.9.0/Makefile.PL
pgsql_perl5-1.9.0/Pg.pm
pgsql_perl5-1.9.0/Pg.xs
pgsql_perl5-1.9.0/README
pgsql_perl5-1.9.0/test.pl
pgsql_perl5-1.9.0/typemap
Removing previously used /root/.cpan/build/pgsql_perl5-1.9.0
CPAN.pm: Going to build M/ME/MERGL/pgsql_perl5-1.9.0.tar.gz
Configuring Pg
Remember to actually read the README file !
please set environment variables POSTGRES_INCLUDE and POSTGRES_LIB !
Running make test
Make had some problems, maybe interrupted? Won't test
Running make install
Make had some problems, maybe interrupted? Won't install
####################################################

I already set environment variables POSTGRES_INCLUDE and POSTGRES_LIB.

thanks,

chris