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$ cat ~/tmp/pm_11124087/lib/XYZ.pm
package XYZ;

1;

$ cat ~/tmp/pm_11124087/test_lib.pl
#!/usr/bin/env perl
...
use lib 'lib';

use XYZ;

$ ./test_lib.pl
$

$ cd ..
$ pm_11124087/test_lib.pl
Can't locate XYZ.pm in @INC (you may need to install the XYZ module) (
+@INC contains: lib /home/ken/...

$ cat ~/tmp/pm_11124087/test_lib.pl
#!/usr/bin/env perl
...
use lib "$FindBin::Bin/lib";

use XYZ;

$ ./test_lib.pl
$ cd ..
$ pm_11124087/test_lib.pl
$