Pushed as 15929beb5f1cd2bf96c53eef0f5da3e986c30530, thank you!

I did some small changes to the package definition, so I attach the
actual patch I pushed, so you can review it and hopefully learn from it
:)

When you don't need a phase, you can delete it, instead of replacing it
with a procedure that does nothing. To pass arguments to the make
command, you can use the #:make-flags argument.