CMake Warning:
  Manually-specified variables were not used by the project:

    CONAN_EXPORTED
    CONAN_IN_LOCAL_CACHE


CMake Warning:
  Manually-specified variables were not used by the project:

    CMAKE_EXPORT_NO_PACKAGE_REGISTRY


eigen/3.3.7: WARN: This conanfile has no build step
eigen/3.3.7: WARN: compiler setting should be defined.
eigen/3.3.7: WARN: compiler setting should be defined.