setting the environment variables in perl

[jason corbett]

How does one go about assuring that the environment variables are properly set in 
perl? I read several books, but none go in depth about how to write a script that 
includes all the required variables, that way nothing gets left out. 
 
Please advise.
 
JC
 
[snipet]
 
 
#!/usr/bin/perl -w

$ENV{"ORACLE_HOME"}="/orav101/oracle/8.1.7";

use strict; 
use DBI;
use lib '/home/samcsm/jason/myperl/lib/perl5/site_perl/';