Appologies for the noise. The problem was explained serveral lines up in the output: MIME::Base64 was out of date. Below is the exact text.

Thanks, all, for the great service!

Checking for module MIME::Base64 (version 3.03)... not found.
 --- Fallback: Checking for module MIME::Base64 (version 2.20)... ok.

   *** Warning: We can work with version 2.20 of MIME::Base64, but
   *** we recommend that you upgrade to version 3.03.

   *** Note that if you type 'make test', then tests
   *** 4, 5 and 7-11 of t/Misc.t may fail because of the old version
   *** of MIME::Base64