I apologize for the back-and-forth, but.. with that fix (Which I had already tried..) - I get:

Your vendor has not defined Fcntl macro F_GETFL, used at ...

If I then change F_GETFL to something random like F_GETFALLY or the such, I again get:

fcntl is not implemented ...

But.. again, it all works perfectly on the unix side. Frustrating me, indeed.

Daimun