eigen in groovy for ubuntu 12.04 armhf

edit

I actually came across a similar issue yesterday. I don't know if it's the exact problem you're having but just in case...

I found that Eigen was installed but it was installed here:

./usr/local/include/eigen3

My specific issue was regarding compiling against MoveIt! and the compilation was looking for "Eigen/Geometry", not "eigen3/Eigen/Geometry". I just created a simlink in that directory (./usr/local/include/) to resolve my problem:

cd /usr/local/include
ln -s eigen3/Eigen Eigen

You can check that everything is set by executing these commands:

cd /usr/local/include ls -l Eigen

And the output should look something like:

lrwxrwxrwx 1 root root   12 Oct 10 13:35 Eigen -> eigen3/Eigen