diff -ru spack-src/server/CMakeLists.txt spack-src.new/server/CMakeLists.txt
--- spack-src/server/CMakeLists.txt	2018-06-12 23:00:55.000000000 +0900
+++ spack-src.new/server/CMakeLists.txt	2019-07-16 19:05:23.842478919 +0900
@@ -84,7 +84,13 @@
 	add_definitions(-DISAAC_JPEG)
 endif (ISAAC_JPEG)
 
-add_definitions(-std=c++11 -march=native -mtune=native)
+if (CMAKE_SYSTEM_PROCESSOR STREQUAL aarch64 AND
+    CMAKE_C_COMPILER_ID STREQUAL GNU AND
+    CMAKE_C_COMPILER_VERSION VERSION_LESS 6.0)
+    add_definitions(-std=c++11)
+else ()
+    add_definitions(-std=c++11 -march=native -mtune=native)
+endif ()
 
 add_executable(isaac ${HDRS} ${SRCS})