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@INC

The array @INC contains the list of places to look for Perl scripts to be evaluated by the do EXPR, require, or use constructs. It initially consists of the arguments to any -I command line switches, followed by the default Perl library, probably /usr/local/lib/perl, followed by ``.'', to represent the current directory. If you need to modify this at runtime, you should use the use lib pragma to get the machine-dependent library properly loaded also:

    use lib '/mypath/libdir/';
    use SomeMod;

Source: Perl predefined variables
Copyright: Larry Wall, et al.

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