dev-embedded/pikdev depends on dev-qt/qtwebkit:4 which is ancient and will never see any security updates. Since upstream appears to be dead and no Qt 5 port is available, it might be time to remove this package if webkit support cannot be disabled.
commit 8d646d9d4fbf6954590ccc89a77b3ad783716ae7 Author: Michał Górny <mgorny@gentoo.org> AuthorDate: Mon Aug 14 09:27:38 2017 Commit: Michał Górny <mgorny@gentoo.org> CommitDate: Mon Aug 14 09:28:20 2017 dev-embedded/pikdev: Remove last-rited pkg, #620698 dev-embedded/pikdev/Manifest | 1 - dev-embedded/pikdev/metadata.xml | 13 ---------- dev-embedded/pikdev/pikdev-1.4.0.ebuild | 46 --------------------------------- profiles/package.mask | 5 ---- 4 files changed, 65 deletions(-)