Devel::Cover in MakeMaker

I'm setting up an agile development environment for a client while 
writing modules most likely targeted for CPAN. I'd like to generate 
coverage on every invocation of 'make test'. What's the current state of 
making this happen?

It's on the Test::Harness TODO list, but Andy said it's not near the top 
of his list now, and that wouldn't cover the complete integration. Any 
pointers or suggestions on it? Should I just switch to Module::Build and 
use the testcover target?

Steve