Is there a 'catch' with FastFormat?

Question

I just read about the FastFormat C++ i/o formatting library, and it seems too good to be true: Faster even than printf, typesafe, and with what I consider a pleasing interface:<

Answer 1

The library depends on a couple of environment variables, as mentioned in the docs.

That might be no biggie to some people, but I'd prefer my code to be as self-contained as possible. If I check it out from source control, it should work and compile. It won't, if it requires you to set environment variables.