keep manatee inside repo?

I really hope to keep manatee inside repo. Although the manatee author has stated that he won't maintain it anymore.

I try to build manatee (after it stops development for 2 years), and I can successfully build manatee, but I get a runtime error when manatee starts:
`manatee: thread blocked indefinitely in an MVar operation`

I am new to haskell, and the patches below are flawed. And manatee can build but can't run.
But I really hope to keep manatee inside repo.