Master does not compile if opencv2 not installed.

The title says it all.
I have ubuntu 16 hence opencv3, master branch does not compile.
I tracked a couple of files : constraint_AHP.h landmark_point_3d.h landmark_point_3d.cpp yaml/processor_image_yaml.cpp

before giving up on ceres_wrapper/create_auto_diff_cost_function.h ceres_wrapper/create_auto_diff_cost_function.cpp

As anyone fix the compilation already ?
Or should I continue ??