LSD slam viewer package cannot be found

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Hi! ROS master friends in all over the world! I'm newbie in ROS. I'm proceeding the lsd slam following here.

First of all, I did the section 2.2 ROS indigo + Ubuntu 14.04(I'm using these version) But, the last stage of 2.2, I typed the, rosmake lsd slam. Then, I faced the error. "[rosmake] ERROR : No arguments could be parsed into valid package or stack names."

And I type the following commend :rosrun lsd_slam_viewer viewer

But, [rospack] ERROR : package 'lsd_slam_viewer' not found This error message bothers me!!

How can I solve this problem? Before start the these process, I did "clone or download" on top of the page.