Where did the bus label go?

1

I decided to build an old project using the latest IPlug2 code.
However, I was discouraged because in the old code, the IBusInfo class declaration had the following:
IBusInfo(ERoute direction, int nchans = 0, const char* label = "")
In the latest version, the label was dropped from the declaration:
IBusInfo(ERoute direction, int nchans = 0)
And how do I label a bus now?