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An alternative way to set the SITE_ROOT:

    BEGIN {
    use utf8;
    use strict;
    use warnings;
    # Set libpath (needed for mod_perl)
    our $SITE_ROOT = $ENV{"SCRIPT_FILENAME"} ;
    $SITE_ROOT =~s/^(.*?)\/[^\/]+$/$1/;
    }
    use lib $SITE_ROOT.'/perl/lib';