ci74771ht ~ # emerge -DNu world --with-bdeps=y
Calculating dependencies... done!

!!! The following installed packages are masked:

• kde-apps/kstart-16.04.3::gentoo (masked by: package.mask)
  /usr/portage/profiles/package.mask/00-gentoo:

1. Andreas Sturmlechner <asturm@gentoo.org> (06 May 2017)
2. Unused Plasma 4 runtime cleanup, masked for removal in 30 days.

• kde-apps/kquitapp-16.04.3::gentoo (masked by: package.mask)
• kde-apps/kdebase-desktoptheme-16.04.3::gentoo (masked by: package.mask)
• kde-apps/kdebugdialog-16.04.3::gentoo (masked by: package.mask)
• kde-apps/kdesu-16.04.3::gentoo (masked by: package.mask)
• kde-apps/kiconfinder-16.04.3::gentoo (masked by: package.mask)
• kde-apps/libkonq-16.08.3::gentoo (masked by: package.mask)
  /usr/portage/profiles/package.mask/00-gentoo:

1. Andreas Sturmlechner <asturm@gentoo.org> (06 May 2017)
2. Follow-up to 16.12.3 stabilisation - the remaining split
3. kde-baseapps are now either part of konqueror:5 or obsolete.
4. Masked for removal in 30 days.

• kde-apps/kimgio-16.04.3::gentoo (masked by: package.mask)
• kde-apps/kdebase-menu-16.04.3::gentoo (masked by: package.mask)
• kde-apps/solid-runtime-16.04.3::gentoo (masked by: package.mask)
• kde-apps/kdebase-menu-icons-16.04.3::gentoo (masked by: package.mask)
• kde-apps/kpasswdserver-16.04.3::gentoo (masked by: package.mask)
• kde-apps/renamedlg-plugins-16.04.3::gentoo (masked by: package.mask)
• kde-apps/kurifilter-plugins-16.04.3::gentoo (masked by: package.mask)
  For more information, see the MASKED PACKAGES section in the emerge
  man page or refer to the Gentoo Handbook.

>>> Auto-cleaning packages...

>>> No outdated packages were found on your system.
_______________
I can notice that many old ebuilds are now "hard masked"; Anyway the system runs well '