#7 Include FindEigen3.cmake with the engine.

[Patrick M. Niedzielski]

Our nightly builds are failing to find Eigen3 on a Fedora x64 machine even when it is installed via the package manager (see the output here). This doesn't happen on Debian. The regression was introduced today after merge commit ae3ed4620a7d22e04d4fe13ec792270f2b90654a that added Eigen3 as a dependency.

FindEigen3.cmake isn't included with the CMake distribution, and it seems that it isn't installed with the eigen3 package on Fedora. We should instead include it in our cmake/ directory instead of relying on it being installed.

[Patrick M. Niedzielski]

This should be fixed in commit e652b20a0fe5f8c32f6780e28f6ba8b181691db7 on unstable. I'm going to wait until our nightly tests run to confirm this fix works and then close it.

[Patrick M. Niedzielski]

Fix confirmed by this nightly build.