--- bitcoin-03422e564b552c1d3c16ae854f8471f7cb39e25d/src/wallet/wallet.cpp
+++ bitcoin-0.13.1-cxx11/src/wallet/wallet.cpp
@@ -134,7 +134,13 @@ CPubKey CWallet::GenerateNewKey()
             // childIndex | BIP32_HARDENED_KEY_LIMIT = derive childIndex in hardened child-index-range
             // example: 1 | BIP32_HARDENED_KEY_LIMIT == 0x80000001 == 2147483649
             externalChainChildKey.Derive(childKey, hdChain.nExternalChainCounter | BIP32_HARDENED_KEY_LIMIT);
+#if defined(__GNUG__) && __GNUG__ < 5
+            char hdkp[9+10+1];
+	    std::sprintf(hdkp, "m/0'/0'/%i'", hdChain.nExternalChainCounter);
+            metadata.hdKeypath     = hdkp;
+#else
             metadata.hdKeypath     = "m/0'/0'/"+std::to_string(hdChain.nExternalChainCounter)+"'";
+#endif
             metadata.hdMasterKeyID = hdChain.masterKeyID;
             // increment childkey index
             hdChain.nExternalChainCounter++;