message: Fix build on mac
diff: @@ -23,10 +23,10 @@ include(ExternalProject)
  include(CMakeDependentOption)
  include(cmake/sdl.cmake)
  -if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
  +if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "^(Apple)?Clang$")
  + set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -Wall -Wno-comment -Wno-sign-compare -Wno-backslash-newline-escape")
  +elseif(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -Wall -Wno-comment -Wno-sign-compare")
  -elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
  - set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -Wall -Wno-comment -Wno-sign-compare -Wbackslash-newline-escape")
  endif()
  # In order to compile ngraph-tf with memory leak detection, run `cmake` with `-DCMAKE_BUILD_TYPE=Sanitize`.
  