Try to build on mac os with Qt 5.10, i get this error : src/scene.cpp:214:23: error: allocating an object of abstract class type 'Box2DDebugDraw'
and also a warning : src/fixture.h:32:1: warning: class 'b2FixtureDef' was previously declared as a struct here : Box2D/Dynamics/b2Fixture.h:56:8: