In the current version the class mitk::Line doesn't compile. This is not detected by the dart clients because the class is only a header file with inline methods and is used nowhere.
The problem is, that in line 83 a itk::point is subtracted from a itk::vector which is not possible in the current itk version. It is simple to fix by replacing line 79 to 83:
itk::Vector<TCoordRep,NPointDimension> point2; point2 = m_Point + m_Direction; m_Point = point1; m_Direction = point2 - point1;
by the following code:
itk::Point<TCoordRep,NPointDimension> point2; point2 = m_Point + m_Direction; m_Point = point1; m_Direction = point2.GetVectorFromOrigin() - point1.GetVectorFromOrigin();
... in addition to the fix, a simple test of this class would be helpful to automatically detect bugs in the future.