Re: [Patch net-next] l2tp: fix compile error when CONFIG_IPV6=m and CONFIG_L2TP=y

From: Cong Wang <redacted>
Date: Tue, 18 Sep 2012 13:54:02 +0800

When CONFIG_IPV6=m and CONFIG_L2TP=y, I got the following compile error:

 ...

This is due to l2tp uses symbols from IPV6, so when l2tp is
builtin, IPV6 has to be builtin too.

Cc: David Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <redacted>

The correct way to express this is:

	depends on (IPV6 || IPV6=n)

Which results in the KCONFIG option only being offers in modes
compatible with the dependency.  Using a 'select' doesn't work
properly in these kinds of cases.

Anyways, grep for that string to see how it is used in other similar
situations.