ROS Hydro on MINT 15, ROS_OS_OVERRIDE

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Hi all,

My name is Bolesław and I am new user of ROS.

I have installed ROS on MINT 15 system, all installing procedure went fine. All packages installed correctly apart from ubs_cam lib! It throws:

ERROR: the following packages/stacks could not have their rosdep keys resolved
to system dependencies:
usb_cam: Unsupported OS [mint]

I have searched the net, ROS wiki and ROS answers. What I found is basically some old posts, which were not connected directly to any ROS release (quite confusing!), something about rosdep.yaml file as well. And I found env ROS_OS_OVERRIDE. I put to terminal:

export ROS_OS_OVERRIDE=ubuntu:raring

When I check rosdep resolve usb_cam

ERROR: No definition of [usb_cam] for OS version []

No definition of [usb_cam] for OS version []
    rosdep key : usb_cam
    OS name    : ubuntu
    **OS version :** 
    Data: _is_ros: true
debian:
  apt:
    packages:
    - ros-hydro-usb-cam
osx:
  homebrew:
    packages:
    - ros/hydro/usb_cam
ubuntu:
  precise:
    apt:
      packages:
      - ros-hydro-usb-cam
  quantal:
    apt:
      packages:
      - ros-hydro-usb-cam
  raring:
    apt:
      packages:
      - ros-hydro-usb-cam

Here comes my question: how to "convince" ROS that beneath MINT there is UBUNTU Raring?

Or maybe there is workaround through OpenCv?

Thanks for any help You can provide.