dev-libs/libIDL is a dependency of sci-electronics/geda-suite however it does not exist in the portage tree

emerge -av sci-electronics/geda-suite

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

Calculating dependencies... done!

emerge: there are no ebuilds to satisfy ">=dev-libs/libIDL-0.8.14-r1[-mgorny(-)]".
(dependency required by "gnome-base/orbit-2.14.19-r5::gnome-kit" [ebuild])
(dependency required by "dev-scheme/guile-gnome-platform-2.16.5::lisp-scheme-kit" [ebuild])
(dependency required by "sci-electronics/gwave-20120229-r1::science-kit" [ebuild])
(dependency required by "sci-electronics/geda-suite-20171223::science-kit" [ebuild])
(dependency required by "sci-electronics/geda-suite" [argument])

emerge -s dev-libs/libIDL

[ Results for search key : dev-libs/libIDL ]
Searching...

• dev-libs/libhid
  Latest version available: 0.2.16-r4
  Latest version installed: [ Not Installed ]
  Size of files: 426 KiB
  Homepage: http://libhid.alioth.debian.org/
  Description: Provides a generic and flexible way to access and interact with USB HID devices
  License: GPL-2

• dev-libs/liboil
  Latest version available: 0.3.17-r2
  Latest version installed: [ Not Installed ]
  Size of files: 892 KiB
  Homepage: https://liboil.freedesktop.org/
  Description: Library of simple functions that are optimized for various CPUs
  License: BSD-2

[ Applications found : 2 ]