The problem is that use lib happens at compile, and the assignment to $BASEDIR doesn't happen until run-time. You could put $BASEDIR in a BEGIN block though:

BEGIN { $BASEDIR = "/export/home/nrc" }
use lib "$BASEDIR/mylib";
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Jeff[japhy]Pinyan: Perl, regex, and perl hacker.
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;