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diff -u c-blosc-1.16.3/CMakeLists.txt c-blosc-1.16.3.mod/CMakeLists.txt
--- c-blosc-1.16.3/CMakeLists.txt	2019-03-08 21:38:45.000000000 +0900
+++ c-blosc-1.16.3.mod/CMakeLists.txt	2019-07-08 18:47:00.660334280 +0900
@@ -197,6 +197,10 @@
   set(CMAKE_MACOSX_RPATH TRUE)
 endif()
 
+if(CMAKE_C_COMPILER_ID STREQUAL GNU)
+    # We need C99 (GNU99 more exactly)
+    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99")
+endif()
 # Based on the target system's processor and the compiler being used,
 # set build variables indicating which hardware features can be targeted
 # by the compiler. Note we DO NOT check which hardware features are supported
@@ -209,8 +213,6 @@
    CMAKE_SYSTEM_PROCESSOR STREQUAL amd64 OR
    CMAKE_SYSTEM_PROCESSOR STREQUAL AMD64)
     if(CMAKE_C_COMPILER_ID STREQUAL GNU)
-        # We need C99 (GNU99 more exactly)
-        SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99")
         set(COMPILER_SUPPORT_SSE2 TRUE)
         if(CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.7 OR CMAKE_C_COMPILER_VERSION VERSION_EQUAL 4.7)
             set(COMPILER_SUPPORT_AVX2 TRUE)