It's not a secret, perldoc lib

NAME
    lib - manipulate @INC at compile time

SYNOPSIS
        use lib LIST;

        no lib LIST;

DESCRIPTION
    This is a small simple module which simplifies the manipulation of
+ @INC
    at compile time.

    It is typically used to add extra directories to perl's search pat
+h so
    that later "use" or "require" statements will find modules which a
+re not
    located on perl's default search path.

  Adding directories to @INC

    The parameters to "use lib" are added to the start of the perl sea
+rch
    path. Saying

        use lib LIST;

    is *almost* the same as saying

        BEGIN { unshift(@INC, LIST) }

    For each directory in LIST (called $dir here) the lib module also 
+checks
    to see if a directory called $dir/$archname/auto exists. If so the
    $dir/$archname directory is assumed to be a corresponding architec
+ture
    specific directory and is added to @INC in front of $dir.

    To avoid memory leaks, all trailing duplicate entries in @INC are
    removed.

  Deleting directories from @INC

    You should normally only add directories to @INC. If you need to d
+elete
    directories from @INC take care to only delete those which you add
+ed
    yourself or which you are certain are not needed by other modules 
+in
    your script. Other modules may have added directories which they n
+eed
    for correct operation.

    The "no lib" statement deletes all instances of each named directo
+ry
    from @INC.

    For each directory in LIST (called $dir here) the lib module also 
+checks
    to see if a directory called $dir/$archname/auto exists. If so the
    $dir/$archname directory is assumed to be a corresponding architec
+ture
    specific directory and is also deleted from @INC.

  Restoring original @INC

    When the lib module is first loaded it records the current value o
+f @INC
    in an array "@lib::ORIG_INC". To restore @INC to that value you ca
+n say

        @INC = @lib::ORIG_INC;

SEE ALSO
    FindBin - optional module which deals with paths relative to the s
+ource
    file.

AUTHOR
    Tim Bunce, 2nd June 1995.
[download]

  How do I add a directory to my include path at runtime?

            Here are the suggested ways of modifying your include path
+:

                the PERLLIB environment variable
                the PERL5LIB environment variable
                the perl -Idir command line flag
                the use lib pragma, as in
                    use lib "$ENV{HOME}/myown_perllib";

            The latter is particularly useful because it knows about m
+achine
            dependent architectures. The lib.pm pragmatic module was f
+irst
            included with the 5.002 release of Perl.
[download]

 

______crazyinsomniac_____________________________ Of all the things I've lost, I miss my mind the most. perl -e "$q=$_;map({chr unpack qq;H*;,$_}split(q;;,q*H*));print;$q/$q;"