>>>>> On Thu, 20 Feb 2014, Alexandre Rostovtsev wrote: > Unfortunately, at the same time, lots of other developers are going > to start adding support for building against gtk2 XOR gtk3. Because > of course "Gentoo is about choice", and the more choices, the > merrier, and the gtk3 flag has been declared as supported by the QA > team. And that means lots of REQUIRED_USE="^^ ( gtk gtk3 )".
No, in most cases REQUIRED_USE would be against policy. The actual policy is to "pick one of the USE flags in conflict to favour and should alert the user that a particular flag is being used instead", see the devmanual: http://devmanual.gentoo.org/general-concepts/use-flags/index.html > For the gnome team this results in a headache: maintaining a big > list of "-gtk" / "-gtk3" entries in > targets/desktop/gnome/package.use so that gnome users get a sensible > choice and don't need to edit /etc/portage/* just to emerge widely > used desktop tools. Right, and that's exactly the reason why REQUIRED_USE should not be used, except where it's forced be reverse USE dependencies. Quoting the devmanual again: "Note: In order to avoid forcing users to micro-manage flags too much, REQUIRED_USE should be used sparingly. Follow the normal policy whenever it is possible to do a build that will presumably suit the user's needs." Ulrich
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