include_directories(${OPENSSL_INCLUDE_DIR}) link_directories(${OPENSSL_LIBRARIES}) SET(CERT_ROOT_DIR "${CMAKE_CURRENT_SOURCE_DIR}/certs") SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DCERT_ROOT_DIR=\"\\\"${CERT_ROOT_DIR}\\\"\"") add_executable(simple_ex1 simple_ex1.cc) target_link_libraries(simple_ex1 ssl crypto gtest)