Override drawGroupComponentOutline

Could someone please give me a hint as to where and how to correctly overwrite the
drawGroupComponentOutline method?

I see it is defined in juce_LookAndFeel_V2.cpp, with this signature:

void LookAndFeel_V2::drawGroupComponentOutline (Graphics& g, int width, int height,
const String& text, const Justification& position,
GroupComponent& group)

(I know, this is really a cpp question…)