message: Quote paths.
  So spaces don't break them.
diff: @@ -3,14 +3,14 @@ SET(CMAKE_SYSTEM_PROCESSOR x86_64)
  SET(CMAKE_SYSROOT $ENV{UNREAL_ENGINE_COMPILER_DIR})
  -SET(CMAKE_C_COMPILER $ENV{UNREAL_ENGINE_COMPILER_DIR}/bin/clang.exe)
  -SET(CMAKE_CXX_COMPILER $ENV{UNREAL_ENGINE_COMPILER_DIR}/bin/clang++.exe)
  +SET(CMAKE_C_COMPILER "$ENV{UNREAL_ENGINE_COMPILER_DIR}/bin/clang.exe")
  +SET(CMAKE_CXX_COMPILER "$ENV{UNREAL_ENGINE_COMPILER_DIR}/bin/clang++.exe")
  SET(CMAKE_BUILD_WITH_INSTALL_RPATH on)
  SET(CMAKE_POSITION_INDEPENDENT_CODE on)
  set(CMAKE_C_COMPILER_TARGET x86_64-unknown-linux-gnu)
  set(CMAKE_CXX_COMPILER_TARGET x86_64-unknown-linux-gnu)
  -SET(CMAKE_CXX_FLAGS "-nostdinc++ -I$ENV{UNREAL_ENGINE_LIBCXX_DIR}/include -I$ENV{UNREAL_ENGINE_LIBCXX_DIR}/include/c++/v1 -I$ENV{UNREAL_ENGINE_LIBCXX_DIR}/include/c++/v1")
  +SET(CMAKE_CXX_FLAGS "-nostdinc++ \"-I$ENV{UNREAL_ENGINE_LIBCXX_DIR}/include\" \"-I$ENV{UNREAL_ENGINE_LIBCXX_DIR}/include/c++/v1\" \"-I$ENV{UNREAL_ENGINE_LIBCXX_DIR}/include/c++/v1\"")
  # search for programs in the build host directories
  SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
  