INCLUDE(ExternalProject) SET(EIGEN_SOURCE_DIR ${THIRD_PARTY_PATH}/eigen3) INCLUDE_DIRECTORIES(${EIGEN_SOURCE_DIR}/src/extern_eigen3) ExternalProject_Add( extern_eigen3 ${EXTERNAL_PROJECT_LOG_ARGS} GIT_REPOSITORY "https://github.com/RLovelett/eigen.git" GIT_TAG "master" PREFIX ${EIGEN_SOURCE_DIR} UPDATE_COMMAND "" CONFIGURE_COMMAND "" BUILD_COMMAND "" INSTALL_COMMAND "" TEST_COMMAND "" ) if (${CMAKE_VERSION} VERSION_LESS "3.3.0") set(dummyfile ${CMAKE_CURRENT_BINARY_DIR}/eigen3_dummy.c) file(WRITE ${dummyfile} "const char * dummy_eigen3 = \"${dummyfile}\";") add_library(eigen3 STATIC ${dummyfile}) else() add_library(eigen3 INTERFACE) endif() add_dependencies(eigen3 extern_eigen3) LIST(APPEND external_project_dependencies eigen3)