rgbdslam: Missing resource opencv2

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I'm trying to build rgbdslam_v2 in ROS Indigo. However, ｔhe following error goes out.

~/catkin_ws/src $ rosdep install rgbdslam_freiburg

ERROR: the following packages/stacks could not have their rosdep keys resolved to system dependencies: rgbdslam: Missing resource opencv2

ROS path [0]=/opt/ros/indigo/share/ros; ROS path [1]=/home/usersname/catkin_ws/src; ROS path [2]=/opt/ros/indigo/share; ROS path [3]=/opt/ros/indigo/stacks;

Please teach me.