The following error happened during an emerge update: !!! Problem resolving dependencies for net-analyzer/wireshark from @selected ... done! !!! The ebuild selected to satisfy "net-analyzer/wireshark" has unmet requirements. - net-analyzer/wireshark-1.12.7::gentoo USE="caps crypt doc doc-pdf filecaps gtk3 ipv6 netlink pcap qt4 qt5 ssl zlib -adns -geoip -kerberos -lua -por taudio -sbc (-selinux) -smi" ABI_X86="64" The following REQUIRED_USE flag constraints are unsatisfied: at-most-one-of ( qt4 qt5 ) The above constraints are a subset of the following complete expression: ssl? ( crypt ) at-most-one-of ( qt4 qt5 ) (dependency required by "@selected" [set]) (dependency required by "@world" [argument]) And thus the system cannot be updated.
(In reply to Guanpeng Xu from comment #0) > The following REQUIRED_USE flag constraints are unsatisfied: > at-most-one-of ( qt4 qt5 ) So set something like net-analyzer/wireshark -qt4 qt5 in your /etc/portage/package.use