ros indigo gazebo_ros_pkgs empty [closed]

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Hello !

I need to migrate some packages from ros groovy to ros indigo.
My problem is that one of these packages have a dependency with gazebo_worlds. For Indigo, I saw that this is gazebo_ros_pkgs which replaced gazebo_worlds.
My question is: why is the gazebo_ros_pkgs empty ? It contains only a package.xml and therefore, when I run catkin_make, I get the following error:

CMake Error at /opt/ros/indigo/share/catkin/cmake/catkinConfig.cmake:83 (find_package):
  Could not find a package configuration file provided by "gazebo_ros_pkgs"
  with any of the following names:

    gazebo_ros_pkgsConfig.cmake
    gazebo_ros_pkgs-config.cmake

Moreover, some of launch files of the concerned package use stuffs inside the gazebo_worlds package.

If someone could help me, I will be very grateful,
lfr