There were many things to be done to bootstrap the project, I chose to try to quantify the drawing. It turned out to be a strait forward task.

Nothing had to be changed in the Objective-C part, yet code size grew dramatically, since the initial set up using mtl did contain some boilerplates.

There was a problem though: I could not figure out how to use ghci to inspect Main.hs, as Main.hs requires linking to C.

It also turns out that remote logging is not necessary, the XCode debug panel will show stderr stream.