Import the external package
You can import eigen as usual with PID. In the root CMakelists.txt file of your package, after the package declaration you have to write something like:
It will try to install last version of this external package.
If you want a specific version (recommended), for instance the currently last released version:
CMake usage :
In the CMakeLists.txt files of your applications and tests, or those of your libraries that do not export the dependency:
In the CMakeLists.txt files of libraries exporting the dependency :