message: Small compatibility fix
diff: @@ -15,13 +15,13 @@ namespace visionaray
  struct surface_interaction
  {
  - static const int Unspecified = 1 << 0;
  - static const int Emission = 1 << 1;
  - static const int Diffuse = 1 << 2;
  - static const int SpecularReflection = 1 << 3;
  - static const int SpecularTransmission = 1 << 4;
  - static const int GlossyReflection = 1 << 5;
  - static const int GlossyTransmission = 1 << 6;
  + enum { Unspecified = 1 << 0 };
  + enum { Emission = 1 << 1 };
  + enum { Diffuse = 1 << 2 };
  + enum { SpecularReflection = 1 << 3 };
  + enum { SpecularTransmission = 1 << 4 };
  + enum { GlossyReflection = 1 << 5 };
  + enum { GlossyTransmission = 1 << 6 };
  };
  } // visionaray
  