Increase x-compatibility
diff --git a/lib/zstd.h b/lib/zstd.h
index e4c9ffc..aa4ea23 100644
--- a/lib/zstd.h
+++ b/lib/zstd.h
@@ -1802,11 +1802,15 @@
#ifdef __GNUC__
__attribute__((__unused__))
#endif
-// Disable diagnostic for C++ compatibility
+
+#if defined(__clang__) && __clang_major__ >= 5
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wzero-as-null-pointer-constant"
+#endif
ZSTD_customMem const ZSTD_defaultCMem = { NULL, NULL, NULL }; /**< this constant defers to stdlib's functions */
+#if defined(__clang__) && __clang_major__ >= 5
#pragma clang diagnostic pop
+#endif
ZSTDLIB_STATIC_API ZSTD_CCtx* ZSTD_createCCtx_advanced(ZSTD_customMem customMem);
ZSTDLIB_STATIC_API ZSTD_CStream* ZSTD_createCStream_advanced(ZSTD_customMem customMem);
