Get bounding box of a shape

Bnd_Box bounds;
BRepBndLib::Add(myShape, bounds);
bounds.SetGap(0.0);
Standard_Real fXMin, fYMin, fZMin, fXMax, fYMax, fZMax;
m_boxBound.Get(fXMin, fYMin, fZMin, fXMax, fYMax, fZMax)

when this part of the code is added to the program it says

error C2653: 'BRepBndLib' : is not a class or namespace name
error C3861: 'Add': identifier not found
error C2065: 'm_boxBound' : undeclared identifier
error C2228: left of '.Get' must have class/struct/union
1> type is ''unknown-type''

How can we remove these errors? Do we need to add any header file related to BRepBndLib?