const golang.org/x/sys/unix.RTPROT_KEEPALIVED

one use

	golang.org/x/sys/unix (current package)
		zerrors_linux.go#L2770: 	RTPROT_KEEPALIVED                           = 0x12

The pages are generated with Golds v0.4.9. (GOOS=linux GOARCH=amd64)