Is it possible to undefine or replace the existing enum?

Question

For example there is a ENUM_INDICATOR type which I'd like to undefine and replace with my own, e.g.

#undef ENUM_INDICATOR
#undef IND_AC
#undef IND_AD
#undef IND_AC
#ifndef ENUM_INDICATOR
enum ENUM_INDICATOR {
  IND_AC,
  IND_AD,
  IND_NONE,
}
#endif

However none of above works, because compiler complains as below:

'ENUM_INDICATOR' - enumeration already defined

'IND_AC' - enumerator identifier already defined

Is there any chance to undefine or remove the existing builtin enum types?

Answer 1

It is impossible to undefine the existing enum declaration or its items.

^{Source: Response from Support Team at MQL5.}