Preferred method of including BOOL type with the DDE

What’s the “recommended” way of having a boolean type defined when using the DDE?

I’ve found BOOL defined in “toolbox.h”, but as it’s such a fundamental type, I was wondering if there’s a more appropriate header people use as “standard practice”?

stdbool.h

How did I miss that? (Probably because there are a million directories!)

Thanks, Dave.

stdbool.h is part of C99, I understand.