relative paths are relative, and unless you use chdir, they're often wrong

Also, @INC is @INC

Also, lib is a core module

So don't rely on cwd() being "t" or "..\t" because thats weak sauce, one way

 
BEGIN {
    use File::Spec;
    use File::Basename();
    our $thisf = File::Spec->rel2abs( $0 );
    our $thisd = File::Basename::dirname($thisf);
}
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then you can  require "$thisd/lib.pm" or chdir $thisd; ...