[jade] eigen3 not found build error

edit

Even after following jade/Migration for Eigen, I still see that eigen3 is not found.

https://travis-ci.org/swri-robotics/m...

CMake Error at CMakeLists.txt:12 (find_package): 
  By not providing "FindEigen3.cmake" in CMAKE_MODULE_PATH this project has 
  asked CMake to find a package configuration file provided by "Eigen3", but 
  CMake did not find one. 

  Could not find a package configuration file provided by "Eigen3" with any 
  of the following names: 

    Eigen3Config.cmake 
    eigen3-config.cmake 

  Add the installation prefix of "Eigen3" to CMAKE_PREFIX_PATH or set 
  "Eigen3_DIR" to a directory containing one of the above files.  If "Eigen3" 
  provides a separate development package or SDK, be sure it has been 
  installed.

This may be happening only on Travis CI, using Travis config from industrial_ci but I'm not sure yet.

Also similar/same issue in a PR on moveit_core (error on Travis). Someone reported that the build moves forward by combining pkg_config but I don't know if that's the best idea (and didn't work for moveit_core).