[cies]

What would be needed to get this to work with Haskell?

I read in the "Getting started":

> You can now create your own targets and compose them.

So does this mean it is a replacement for `make`? => Yes

Found the answer here: http://bazel.io/docs/FAQ.html

[kchod]

If you're interested in adding rules for a new language, check out Skylark: http://bazel.io/docs/skylark/concepts.html.