In fact, it's what I have done. In the beginning I had a huge numbers of errors due to path problem. Now I have only a hundred errors. But the less error I have the more difficult it is to solve them (is that understandable).
In that particular case, it's the first time I see we can be allowed to only give 'char *' without a name .
I don't know what _INTERNAL_IFSTRIP_ is for; but I put it in 'preprocesor definition' and now I can compile. I mean I can go on compiling all other errors of the solution (I have a lot). I'll come back to _INTERNAL_IFSTRIP_ later.