What do you think the "error" means?

Did you add "use diagnostics;" to get a more verbose "error" message?

Do you have defined $ENV{LIBUSB_LIBDIR} ? Try getting rid of that (not defining it)

In reply to Re: Device::USB gives "Use of uninitialized value in concatenation" error by Anonymous Monk
in thread Device::USB gives "Use of uninitialized value in concatenation" error by holandes777

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