require only loads once and this WILL bite in any persistent environment. 
$ echo 'print 1;' > test.pl
$ perl -le'{ local %INC; require "test.pl" } require "test.pl";'
1
1

[download]
Update: that should be local %INC = %INC; in fact.

Makeshifts last the longest.

In reply to Re^2: including another perl file (dynamic scoping) by Aristotle
in thread including another perl file by Anonymous Monk

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