#define NB_USE_OWN_ACOSH 1
Define NB_USE_OWN_ACOSH to have the interpreter use its own implementation of acosh.
The system version of acosh is preferred, but some compilers do not provide an implementation of acosh. 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.