Okay debugging might help me understand the 'CPANPLUS' module, and it might be an error somewhere in my dist - perhaps a stray new line. But it is clear that it did not get as far as running any tests. Being an error in the 'fetch' method it might not have even downloaded the code. The thing is I don't know and I cannot even attempt to replicate the scenario. There are over 30 PASS or FAIL results and those I can work with, but I don't know what this one means. Could you post the errors messages you got so I can compare, and what was the issue?
Since you have over 30 pass or fail results, then one UNKNOWN on Solaris isn't worth losing sleep over:-). I built mine using ExtUtils::MakeMaker mostly because I"ve had problems with CPANPLUS and Module::Build in the past when it comes to installing dependencies. Maybe you could post your Build.PL
and a small snippet of a failure?