message: third_party: cmake_path is not available yet
diff: @@ -103,7 +103,9 @@ elseif(MSVC)
  message("OPENSSL_BUILD_TYPE set to ${OPENSSL_BUILD_TYPE}")
  message("CMAKE_INSTALL_PREFIX: ${CMAKE_INSTALL_PREFIX}")
  - cmake_path(NATIVE_PATH CMAKE_INSTALL_PREFIX NORMALIZE NATIVE_INSTALL_PREFIX)
  + # Only available from cmake 3.20, for now do it manually.
  + #cmake_path(NATIVE_PATH CMAKE_INSTALL_PREFIX NORMALIZE NATIVE_INSTALL_PREFIX)
  + string(REPLACE "/" "\\" NATIVE_INSTALL_PREFIX ${CMAKE_INSTALL_PREFIX})
  message("NATIVE_INSTALL_PREFIX: ${NATIVE_INSTALL_PREFIX}")
  ExternalProject_add(
  