message: defaulting to prebuilt llvm
diff: @@ -26,6 +26,8 @@ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -Wall -Wno-comment -Wno-sign-
  set(CMAKE_DISABLE_SOURCE_CHANGES ON)
  set(CMAKE_DISABLE_IN_SOURCE_BUILD ON)
  +set(NGRAPH_USE_PREBUILT_LLVM "True" CACHE STRING "Using prebuilt LLVM by default")
  +
  # Find and build ngraph
  ExternalProject_Add(
  ext_ngraph
  