Openni compilation error
I'm getting a compilation error when building openni on Ubuntu 10.10:
In file included from openni_camera/src/openni_driver.cpp:43: openni_camera/include/openni_camera/openni.h:45: fatal error: Eigen/Core: No such file or directory
I'm using the version checked out from git https://github.com/ros-pkg-git/ni.git with an svn installation of ROS. Presumably there's some library that I'm missing.