OpenCV and its dependencies

depends on #1079
+1 , and verify with ldd, after loading the modules tree.

I cannot overstress how important is to use `ldd` after your builds are finished to inspect what you are linking with. I had my good set of lessons while busy on opencv-with-cuda on #679, finding out that `configure` has a life of its own and you are at the mercy of documentation of reported errors to understand what is going on. 

It may be recommended, in fact, that it becomes standard practice to do the ldd inspection, as soon as the first builds are there for any software piece (to be fair, I do this only occasionally).