No need. eval returns undef on expection. Otherwise, it returns true because of the 1;. It would return true even without the 1; because require always returns true or an exception.

Incidentally, eval EXPR is not needed here. eval BLOCK suffices. 

if (eval { require LWP::UserAgent })

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In reply to Re^2: Testing if machine has LWP... not working by ikegami
in thread Testing if machine has LWP... not working by lokiloki

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