empty_filter_d…

eigen.cmake
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			package_declare(Eigen3 EXTERNAL
			DESCRIPTION "Add Eigen3 dependency to akantu"
			SYSTEM AUTO third-party/cmake/eigen3.cmake
			EXTRA_PACKAGE_OPTIONS ARGS 3.4
			)
			mark_as_advanced(Eigen3_DIR)
			package_add_third_party_script_variable(Eigen3
			EIGEN3_VERSION "3.4.0")
			package_add_third_party_script_variable(Eigen3
			EIGEN3_GIT "https://gitlab.com/libeigen/eigen.git")