htod (8.52.5n) not recognizing wchar_t?

[DanielG via Digitalmars-d-learn]

According to this page (https://dlang.org/htod.html), wchar_t 
should be recognized as wchar. But I'm just getting an error: 
"Error: ')' expected" ... anywhere a wchar_t appears in my .h 
file.

Anything I need to do? I'd prefer to keep this entire file 
uncommented so I don't always have to hand-edit the results of 
htod.

cheers