if(TARGET Eigen3::Eigen)
  return()
endif()

include(FetchContent)
FetchContent_Declare(
  eigen
  GIT_REPOSITORY https://gitlab.com/libeigen/eigen.git
  GIT_TAG 3.4.0
  GIT_SHALLOW TRUE
  GIT_PROGRESS TRUE
  OVERRIDE_FIND_PACKAGE
)

set(EIGEN_BUILD_DOC OFF CACHE BOOL "" FORCE)
set(BUILD_TESTING OFF)
set(EIGEN_BUILD_PKGCONFIG OFF)

FetchContent_MakeAvailableExclude(eigen)

set(Eigen3_DIR ${eigen_BINARY_DIR})