POSTGRES_INCLUDE and POSTGRES_LIB??

Dear Knowlegable People:

I was overcome with joy when Postgres installed on the server seamlessly.
That doesn't seem to happen often with things I do. However, when I tried
to install Pg.pm (by the "perl -MCPAN -e -shell" method), I ran into
problems.
Part of the error message is:
"please set environment variables POSTGRES_INCLUDE and POSTGRES_LIB !".
Where/how do I do this and with what values? (I'm pretty new to Linux, and
the job of maintaining this server was an "emergency Undertaking".)
Below are details which should be helpful.

Thanx For Your Help,
Bill Tuck
wat(at)england(dot)com

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Installed on this server (each done with rpm -i
postgres(the_rest_of_the_filename).rpm

postgresql-server-6.5.3-1.i386.rpm
postgresql-6.5.3-1.i386.rpm
postgresql-devel-6.5.3-1.i386.rpm
postgresql-odbc-6.5.3-1.i386.rpm
postgresql-perl-6.5.3-1.i386.rpm
postgresql-test-6.5.3-1.i386.rpm

(these were downloaded from ftp://ftp.postgresql.org/pub/RPMS/redhat-6.x/)
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Output of "perl -MCPAN -e -shell" session

cpan> install DBD::Pg
Going to read /shadow/.cpan/sources/authors/01mailrc.txt.gz
CPAN: Compress::Zlib loaded ok
Going to read /shadow/.cpan/sources/modules/02packages.details.txt.gz
Scanning cache /shadow/.cpan/build for sizes
Going to read /shadow/.cpan/sources/modules/03modlist.data.gz
Running make for MERGL/DBD-Pg-0.93.tar.gz
CPAN: MD5 loaded ok
Checksum for /shadow/.cpan/sources/authors/id/MERGL/DBD-Pg-0.93.tar.gz ok
DBD-Pg-0.93/
DBD-Pg-0.93/eg/
DBD-Pg-0.93/eg/ApacheDBI.pl
DBD-Pg-0.93/Changes
DBD-Pg-0.93/MANIFEST
DBD-Pg-0.93/Makefile.PL
DBD-Pg-0.93/Pg.h
DBD-Pg-0.93/Pg.pm
DBD-Pg-0.93/Pg.xs
DBD-Pg-0.93/README
DBD-Pg-0.93/README.win32
DBD-Pg-0.93/dbd-pg.pod
DBD-Pg-0.93/dbdimp.c
DBD-Pg-0.93/dbdimp.h
DBD-Pg-0.93/test.pl
Removing previously used /shadow/.cpan/build/DBD-Pg-0.93

CPAN.pm: Going to build MERGL/DBD-Pg-0.93.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

cpan>

(Note: The DBI stuff installed seemingly flawlessly.)
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Output of perl -v

This is perl, version 5.005_03 built for i386-linux
(copyright notice printed below.)
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Output of perl -V

Summary of my perl5 (5.0 patchlevel 5 subversion 3) configuration:
Platform:
osname=linux, osvers=2.2.1-ac1, archname=i386-linux
uname='linux porky.devel.redhat.com 2.2.1-ac1 #1 smp mon feb 1 17:44:44
est
1999 i686 unknown '
hint=recommended, useposix=true, d_sigaction=define
usethreads=undef useperlio=undef d_sfio=undef
Compiler:
cc='cc', optimize='-O2', gccversion=egcs-2.91.66 19990314/Linux
(egcs-1.1.2
release)
cppflags='-Dbool=char -DHAS_BOOL -I/usr/local/include'
ccflags ='-Dbool=char -DHAS_BOOL -I/usr/local/include'
stdchar='char', d_stdstdio=undef, usevfork=false
intsize=4, longsize=4, ptrsize=4, doublesize=8
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
alignbytes=4, usemymalloc=n, prototype=define
Linker and Libraries:
ld='cc', ldflags =' -L/usr/local/lib'
libpth=/usr/local/lib /lib /usr/lib
libs=-lnsl -lndbm -lgdbm -ldb -ldl -lm -lc -lposix -lcrypt
libc=, so=so, useshrplib=false, libperl=libperl.a
Dynamic Linking:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'

Characteristics of this binary (from libperl):
Built under linux
Compiled at Apr 6 1999 23:34:07
@INC:
/usr/lib/perl5/5.00503/i386-linux
/usr/lib/perl5/5.00503
/usr/lib/perl5/site_perl/5.005/i386-linux
/usr/lib/perl5/site_perl/5.005
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