Beowulf /home/jim # emerge @module-rebuild -p

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

Calculating dependencies... done!

emerge: there are no ebuilds to satisfy "sys-kernel/debian-sources:4.14.2".
(dependency required by "@module-rebuild" [argument])
Beowulf /home/jim # eix -sI debian-sources
[?] sys-kernel/debian-sources
     Available versions:  
     (4.8.15) 4.8.15^mbs
     (4.14.12) 4.14.12^mbs
     (4.14.17) **4.14.17^mbs
     (4.15.17-r1) 4.15.17-r1^mbs
       {binary btrfs zfs}
     Installed versions:  4.8.15(4.8.15)^mbs(08:27:50 PM 11/02/2017)(binary) 4.14.2(4.14.2)^mbs(02:55:06 PM 01/05/2018)(binary) 4.14.12(4.14.12)^mbs(11:40:10 AM 02/01/2018)(binary) 
4.15.17-r1(4.15.17-r1)^mbs(11:06:46 AM 05/09/2018)(binary -btrfs -zfs)
     Homepage:            http://www.debian.org
     Description:         Debian Sources (and optional binary kernel)