emerge world needs use flag(SOLVED)

[KEA0463]

when i went to emerge world it asks for something
like a +mod, use flag when i added it it keeps asking
for more use flags, and doesn't seem to acept so i kept
it the way it was ans am posting this code to see if
i acn resolve the issue,

[Ant P.]

[KEA0463]

here is what happened next after adding use flag mod
and the other use flags, looks like some conflicting
setting, i'm not sure what i messed up is why i'm posting this here:

[Ant P.]

Look at the "[blocks " lines: it wants several ebuilds up to date before it can merge eselect-opengl. Update those separately then try again.

[KEA0463]

ok, yes, i will emerge and update these packages and see if this fixes
it.

[KEA0463]

No matter what i do I can't seem to resolve these 2 blocks
any advice:

[KEA0463]

i think i may be solving it now:

[hasufell]

let's see what happens... the problematic packages are mesa, xorg-server and eselect-opengl

If you look at the merge-order, you see the following:

[KEA0463]

That was the case, i messed with
Use flags following a guide on
How to add overlays, and got
A unstable package, installed,
That made the mess, i have resolved
The issue, thanks for the help.

[hasufell]

Yep, that was more likely, otherwise the bugtracker would have been flooded by reports.

The problem is that a lot of people still recommend mixing stable and unstable arch (even in this forum). But it's definitely an advanced thing that can cause a lot of trouble.

Users can also file stable-requests on bugzilla... so if you wonder why something isn't stable yet after a period of a month or more in the tree... go to bugzilla.

[hasufell]

As a sidenote: Paludis would show you a proper error/suggestion, unlike portage. I reproduced your issue by unmasking all those related packages, except =media-libs/mesa-10.3.5-r1 (unless you did more things that confuse the PM).

The snipped down output is