Change your manifest.xml/stack.yaml as mentioned on the wiki, and then the easiest is to replicate what's been done here:
https://code.ros.org/svn/ros-pkg/stacks/laser_pipeline/trunk/laser_geometry/
(copy the cmake folder in there and the Eigen content of the main CMakeLists.txt (), as well as the include APPEND on top)
According to http://build.willowgarage.com/job/debbuild-build-debs-unstable-lucid-i386/1588/console
it's because the eigen dependency has not been changed as mentioned by : http://www.ros.org/wiki/eigen
Change your manifest.xml/stack.yaml as mentioned on the wiki, and then the easiest is to replicate what's been done here: https://code.ros.org/svn/ros-pkg/stacks/laser_pipeline/trunk/laser_geometry/ (copy the cmake folder in there and the Eigen content of the main CMakeLists.txt (), as well as the include APPEND on top)
trac data: