cannot "emerge -uDNav world "

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1

~ # emerge -uDNav world

These are the packages that would be merged, in order:

Calculating dependencies /

!!! Problem resolving dependencies for app-text/fbreader from @selected
… done!

!!! The ebuild selected to satisfy “app-text/fbreader” has unmet requirements.

  • app-text/fbreader-0.12.10::gentoo USE=“gtk (multilib) qt4 -debug” CDISTRO=“CLD desktop”

The following REQUIRED_USE flag constraints are unsatisfied:
exactly-one-of ( qt4 gtk )

(dependency required by “selected" [set]) (dependency required by "world” [argument])
~ #

How to deal with this problem ?

2

fbreader can only be qt4 or gtk
to disable gtk use flag run (as root):

echo "app-text/fbreader -gtk" >> /etc/portage/package.use/fbreader

this should solve the problem