That can be simplified to: 
BEGIN {
    if (exists $ENV{LIBPATH}) {
        delete $ENV{LIBPATH};
        exec $^X, __FILE__, @ARGV;
    }
}

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In reply to Re^6: replicating the command 'unset LIBPATH' in perl by JavaFan
in thread replicating the command 'unset LIBPATH' in perl by viffer

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