Keep in mind that environment variables are not yet set at the time of BEGIN
I'm not sure what you mean by that. 
$ perl -we'BEGIN{print $ENV{MANPATH}}'
/usr/man:/usr/local/man:/usr/share/man:/usr/autotool/devel/man:

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In reply to Re^4: What is the scope of BEGIN? Or... when does it "begin?" by ysth
in thread What is the scope of BEGIN? Or... when does it "begin?" by argv

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