this too

CMakeLists.txt

@@ -1,6 +1,14 @@
+set(priv_requires esp_netif esp_wifi nvs_flash)
+set(requires "")
+
+if(CONFIG_SOC_EMAC_SUPPORTED)
+    list(APPEND priv_requires esp_eth esp_driver_gpio ethernet_init)
+    list(APPEND requires lan87xx)
+endif()
+
 idf_component_register(
     SRC_DIRS "."
-    PRIV_REQUIRES esp_netif esp_eth esp_wifi nvs_flash esp_driver_gpio
-    REQUIRES lan87xx
+    PRIV_REQUIRES ${priv_requires}
+    REQUIRES ${requires}
     INCLUDE_DIRS "."
-)
+)