Fix eigen3 depends

[k-okada]

In addition to #5, fixed EIGEN3_INCLUDE_DIRS problem, reported at ros/robot_model#149

Xenial uses eigen 3.5, where as Willy uses 3.2 and 3.2 only provides EIGEN3_INCLUDE_DIR where eigen 3.5 provides EIGEN3_INCLUDE_DIRS
otherwise will have following warning and could not build as reporeted at ros/robot_model#149

Warnings   << eigen_stl_containers:check /home/catkin_ws/logs/eigen_stl_containers/build.check.001.log                             
CMake Warning at /opt/ros/kinetic/share/catkin/cmake/catkin_package.cmake:166 (message):
  catkin_package() DEPENDS on 'EIGEN' but neither 'EIGEN_INCLUDE_DIRS' nor
  'EIGEN_LIBRARIES' is defined.
Call Stack (most recent call first):
  /opt/ros/kinetic/share/catkin/cmake/catkin_package.cmake:102 (_catkin_package)
  CMakeLists.txt:7 (catkin_package)

[dirk-thomas]

You don't have to define the libraries variable. catkin only complains if both variables are undefined - if one is defined it won't print a warning (see https://github.com/ros/catkin/blob/54b7beb709d46c2f5cfb747901907901e954d51e/cmake/catkin_package.cmake#L165-L167).

[dirk-thomas]

Wily (http://old-releases.ubuntu.com/releases/15.10/).

[dirk-thomas]

It would probably be best to run a prerelease job to check that this fixes the problem on Wily before releasing this.

[k-okada]

thanks for a comment, fixed.
if there is something that I need to do to run a prerelase job, please let me know

[dirk-thomas]

A prerelease needs to be run locally. http://prerelease.ros.org can help to configure the command line options but I guess for this case (with the PR on your fork) some manual fiddling might be necessary.

It would be great if you could run one, otherwise the maintainer of this package might do it before merging / releasing.

[k-okada]

A prerelease needs to be run locally. http://prerelease.ros.org can help to configure the command line options

sorry, I have very little knowledge on new technologies like ajax, django..., so what I can do is just running dpkg-buildpackage -> https://gist.github.com/anonymous/415bb06484c4e6bee755ac1a4b7611ad

[k-okada]

also able to run prelease on local machine -> https://gist.github.com/anonymous/6f5dc9f9ba4255fee33fae92405a000c

[dirk-thomas]

@k-okada Thank you for working on the patch as well as testing with the prerelease. It looks good to me.

@wjwwood This seems to address ros/robot_model#149.

[v4hn]

@k-okada please highlight me next time, I found this request only by chance.

+1 The additional patch makes total sense and I actually have no idea why I forgot to handle this case.

Thanks for looking at this @dirk-thomas ! I'm fully confident this does not break anything but allows a number of packages to remove ${EIGEN3_INCLUDE_DIR} from their exported INCLUDE_DIRS.