On Sunday 20 April 2008 22:48, J.O. Aho wrote:

>> For example, all flags disabled, except the foo and bar flags:
>>
>> USE="-* foo bar"
>
> As far as I know, no.

It's indeed possible, and it used to be a widely-used practice for some time
for some people. Doing that nowadays is more risky, since there have been
cases where stuff has broken due to that, see eg bug #183451.