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

Calculating dependencies  ... done!

!!! The ebuild selected to satisfy "dev-python/python3-lxc" has unmet requirements.
- dev-python/python3-lxc-3.0.1::python-modules-kit USE="" PYTHON_TARGETS="-python3_5 -python3_6"

  The following REQUIRED_USE flag constraints are unsatisfied:
    any-of ( python_targets_python3_5 python_targets_python3_6 )

(dependency required by "app-emulation/lxc-3.0.1-r1::core-kit[python]" [ebuild])
(dependency required by "app-emulation/lxd-3.0.0-r1::core-kit[daemon]" [ebuild])
(dependency required by "app-emulation/lxd" [argument])