rosdep 2 install system dependencies

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Hi, it seems like i do not totally understand rosdep2. I could easily add my own system dependencies in rosdep. in the sources.list file I tried to add local yaml file addresses as:

yaml /opt/ros/fuerte/share/ros/opencv.yaml

in order to use my own built opencv-svn (Opencv2.4) package, but it rejects it because:

url must be a fully-specified URL with scheme, hostname, and path

How can I add system dependencies to rosdep2?