What to do?

:)

I imagine first you should check your CPANPLUS configuration, esp make option

I imagine you might upgrade CPANPLUS

I imagine you might Clean %PATH% some more, say use shortnames if you've got them, maybe also remove trailing slashes

I can also imagine reporting this issue if it turns out not to be misconfiguration

I can also imagine reporting this oddly misformatted error message -- which doesn't even mention the name of this 'make' program

I imagine