Download and install openslam_gmapping

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Hi,

I am a beginner to ROS and I have successfully downloaded ROS Indigo. I am using Ubuntu as my OS. I would like to install the package openslam_gmapping on ROS from the source : https://github.com/ros-perception/ope... .

I have been following tutorials to familiarize myself with ROS, among them, I followed this post to attempt to download and install a package: http://answers.ros.org/answers/115386...

Installing hector_slam from the above post was successful and I even managed to run it. However, when I followed the steps of the same post to install and run openslam_gmapping, I was presented with a lot of errors, among them:

rachdar@ubuntu:~$ source /opt/ros/indigo/setup.bash
rachdar@ubuntu:~$ mkdir slam_gmapping
mkdir: cannot create directory ‘slam_gmapping’: File exists
rachdar@ubuntu:~$ mkdir slam_gmapping
rachdar@ubuntu:~$ cd slam_gmapping
rachdar@ubuntu:~/slam_gmapping$ wstool init
Writing /home/rachdar/slam_gmapping/.rosinstall

update complete.
rachdar@ubuntu:~/slam_gmapping$ wstool merge slam_gmapping_catkin.rosinstall
     Performing actions: 

     Add new elements:
  src/slam_gmapping

Config changed, maybe you need run wstool update to update SCM entries.
Overwriting /home/rachdar/slam_gmapping/.rosinstall

update complete.
rachdar@ubuntu:~/slam_gmapping$ wstool update
[src/slam_gmapping] Fetching https://github.com/ros-perception/slam_gmapping.git (version catkin) to /home/rachdar/slam_gmapping/src/slam_gmapping
Cloning into '/home/rachdar/slam_gmapping/src/slam_gmapping'...
remote: Counting objects: 605, done.
remote: Total 605 (delta 0), reused 0 (delta 0)
Receiving objects: 100% (605/605), 112.05 KiB | 0 bytes/s, done.
Resolving deltas: 100% (278/278), done.
Checking connectivity... done.
WARNING [vcstools] Command failed: 'git checkout catkin'
 run at: '/home/rachdar/slam_gmapping/src/slam_gmapping'
 errcode: 1:
error: pathspec 'catkin' did not match any file(s) known to git.
[/vcstools]
Exception caught during install: Error processing 'src/slam_gmapping' : [src/slam_gmapping] Checkout of https://github.com/ros-perception/slam_gmapping.git version catkin into /home/rachdar/slam_gmapping/src/slam_gmapping failed.

ERROR in config: Error processing 'src/slam_gmapping' : [src/slam_gmapping] Checkout of https://github.com/ros-perception/slam_gmapping.git version catkin into /home/rachdar/slam_gmapping/src/slam_gmapping failed.

I don't know what these errors mean. Can someone help please? Thanks a lot!

I am creating this .rosinstall file in gedit text editor:

- git:
    uri: https://github.com/ros-perception/slam_gmapping.git
    local-name: src/slam_gmapping
    version: catkin