Using package.use - ReadList.com

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Using package.use
\ reader (4 May 2008)
. \ Kenneth Prugh (4 May 2008)
. \ reader (4 May 2008)
. . \ Alan McKinnon (4 May 2008)
. \ Alan McKinnon (4 May 2008)

Subject:	Using package.use
Group:	Gentoo-user
From:	reader
Date:	4 May 2008

In man portage I see examples of using package.use

Its listed with address /etc/portage/package.use and shows usage like
this:

some/package:useflag (to add a specific use flag)

I want to subtract a use flag so trying:

(tried with and without quotes just in case the dash (-) was not
acceptable unquoted:

net-analyzer/tcpdump:"-samba"
net-analyzer/tcpdump:-samba

Neither way appears to have an effect on
emerge -vuDNp tcpdump

It still comes up with positive samba use flag. And then when actual
emerging is done, dire warnings are given about using `samba' use
flag.

I'd hoped to use package.use so as not to have to mess with tcpcump
individualy.

Is my syntax wrong or some other problem?

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