--- spack-src/CMakeLists.txt.org	2020-01-08 17:39:08.831616711 +0900
+++ spack-src/CMakeLists.txt	2020-01-08 17:39:27.431716190 +0900
@@ -73,7 +73,7 @@
         endif()
     endif()
 elseif (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native -Wall -Wextra -Wno-missing-field-initializers")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Wno-missing-field-initializers")
     if (RAPIDJSON_BUILD_CXX11)
         set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
     endif()