Got with randconfig:
XXX: undefined reference to `netif_carrier_on'
XXX: undefined reference to `dev_queue_xmit'
...

Signed-off-by: Sebastian Siewior <sebastian@breakpoint.cc>
Index: b/drivers/net/Kconfig
===================================================================
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -5,6 +5,7 @@
 
 menuconfig NETDEVICES
 	default y if UML
+	depends on NET
 	bool "Network device support"
 	---help---
 	  You can say N here if you don't intend to connect your Linux box to

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