No reliable way to figure out the libstdc++ version, but all useful stls on Android deprecate auto_ptr.

rpavlik · rpavlik · commit 9b7db9981b8e · 2016-06-23T10:57:47.000-05:00
diff --git a/src/lib_json/json_tool.h b/src/lib_json/json_tool.h
@@ -21,6 +21,9 @@
 #elif defined(__clang__) && defined(__USE_ISOCXX11) && defined(__GLIBCXX__)
 // clang with libstdc++
 #define JSON_USE_UNIQUE_PTR
+#elif defined(__ANDROID__)
+// android with libstdc++ or libc++
+#define JSON_USE_UNIQUE_PTR
 #endif
 
 namespace Json {
