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Hi everyone,

I've written a patch [1] that implements support for use.force and 
package.use.force as originally described by Sven Wegener [2] over a year ago.  
Basically, this feature is the exact opposite of use.mask and package.use.mask. 
 It forces USE flags to be enabled.  The only way to disable these forced flags 
is to mask them via use.mask/package.use.mask or to "unforce" them in the 
profile stack.  Users can unforce them via 
/etc/portage/profile/{use.force,package.use.force} in the usual "-flag" way.

One of the many benefits that this will provide is the ability to invert the 
no* USE flags so that any flags can potentially have positive meaning if we 
choose.  Some type of functionality like this is certainly needed. Shall we add 
support for this?

Zac

[1] http://dev.gentoo.org/~zmedico/portage/branches/2.1/patches/use.force.patch
[2] http://article.gmane.org/gmane.linux.gentoo.devel/28727
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