Welcome!
Regarding the problems with dub on OSX, that'll be due to separate build + link steps.
It should work ok if you build and link in a single step with the workaround applied.
DC is an environment variable that should point to the D compiler.As a variable this particular one has some sort of story with it, I just can't remember it.
We'd need to know what is requesting it to find out how to resolve it. Please try again with ``-v`` that should tell us what is wanting it.
