Error trying to install gazebo_worlds

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Hello,

I'm trying to install gazebo on Fedora 15 following the instructions here:

Starting Gazebo

I've followed all the beginner tutorials and ROS worked fine, so I assume it's correctly installed.

When I try to install gazebo I get the following error:

[manu@manu simulator_gazebo]$ rosdep install gazebo_worlds
Failed to find rosdep eigen for package gazebo_worlds on OS:fedora version:15
rosdep install ERROR:
failed to install eigen

I couldn't find an answer related to this... does somebody know how to solve this dependency?