adding include path

[lane]

Polygon.hpp

[eranif]

Then you see the problem...
Polygon.hpp is looking for Polygon.h which is not there - hence your compile problem.
You need to understand where is the file (Ploygon.h) located and I am afraid that you will have to take this question elsewhere (i.e. to the forum / mailing list of the library that you are using)

Eran

[lane]

Thank You Very Much!

I will check out somewhere else, but I do appreciate the support I have received here.

Thanks,
lane