calculate ~ # emerge app-misc/qlcplus
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Calculating dependencies /
!!! Problem resolving dependencies for app-misc/qlcplus
... done!
!!! The ebuild selected to satisfy "app-misc/qlcplus" has unmet requirements.
- app-misc/qlcplus-4.10.4::gentoo USE="-qt4 -qt5 -test" ABI_X86="64"
The following REQUIRED_USE flag constraints are unsatisfied:
exactly-one-of ( qt4 qt5 )