[fltk.general] Fl::fatal and Fl::error trying to override

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Fl::fatal and Fl::error trying to override George Reeke Jul 31, 2022 top right image
I am at fltk 1.3.5 but also trying 1.3.8
Doc says I can provide my own versions of Fl::error() and Fl::fatal() to override the default actions (basically exit).  I am providing this code in my routine, compiling with gcc, and I get an error message "no 'void Fl::error(const char*, ...)' member function declared in class 'Fl'.
My code is this:
void Fl::error(const char *fmt, ...) __attribute__((noreturn));
void Fl::error(const char *fmt, ...) { <some code> }
What do I have to do to replace the default functions with my functions?

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