lvm2-2.03.14 introduced VDO (Virtual Disk Optimizer) support. Introducing a new use flag to pass --with-vdo=none|internal configure switch.
https://github.com/gentoo/gentoo/pull/25936 fixes this issue.
*** Bug 743986 has been marked as a duplicate of this bug. ***
Somebody needs to package dm-vdo first.
I have some stale vdo ebuilds which I use, fancy another pull request?
VDO is split in two parts:
kvdo - kernel module(s) and
vdo - userland utilities
Which one are you interested in here?