AcDbCivilHAlignmentElement::EElementType

Hi
I am trying to write some code to extract information from a civil alignment. The code I have written below will not compile:

switch (element->type()) {
case EElementType::eLine:
acutPrintf(_T("\neLine."));
break;

default:
break;
}

Unfortunately I am getting the error "Use of undeclared identifier 'EElementType'" on the second line of code. Is there something I am missing?
Cheers
Brian

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