#define NB_USE_OWN_ATANH 1
Define NB_USE_OWN_ATANH to have the interpreter use its own implementation of atanh.
The system version of atanh is preferred, but some compilers do not provide an implementation of atanh. In this case, a substitute is provided so that the CoreBASIC intrinsic is still available, but it is not guaranteed to be numerically stable for all arguments.