only use ksz8081 for idf versions later than 4.3

liebman · liebman · commit d221c5ce06a6 · 2021-08-26T09:08:53.000-07:00
diff --git a/libraries/WiFi/src/ETH.cpp b/libraries/WiFi/src/ETH.cpp
@@ -287,8 +287,10 @@ bool ETHClass::begin(uint8_t phy_addr, int power, int mdc, int mdio, eth_phy_typ
             eth_phy = esp_eth_phy_new_dm9051(&phy_config);
             break;
 #endif
+#if ESP_IDF_VERSION_MINOR > 3 || ESP_IDF_VERSION_MAJOR > 4 // added starting after 4.3
         case ETH_PHY_KSZ8081:
             eth_phy = esp_eth_phy_new_ksz8081(&phy_config);
+#endif
         default:
             break;
     }
