Mac Install (Sierra) - ERROR: the following packages/stacks could not have their rosdep keys resolved to system dependencies: webkit_dependency: No definition of [python-qt5-bindings-webkit] for OS [osx]

edit

Following this: http://wiki.ros.org/kinetic/Installat... carefully. I know there's a comment that says "it doesn't work" but I thought I could help improve it. Everything went well until:

~/ros_catkin_ws rosdep install --from-paths src --ignore-src --rosdistro kinetic -y
ERROR: the following packages/stacks could not have their rosdep keys resolved to system dependencies:
webkit_dependency: No definition of [python-qt5-bindings-webkit] for OS [osx]

Any tips?