>>> Emerging : portage://games-arcade/barbarian-bin-1.01-r3:run?{[]}

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

Calculating dependencies... done!

 └─step  1─┤ unmask  portage://games-arcade/barbarian-bin-1.01-r3

 └─step  2─┤ verify  media-libs/libsdl (unsatisfied constraints, assumed running)
             │ verify  sys-libs/libstdc++-v3 (unsatisfied constraints, assumed running)
             │ download  portage://games-arcade/barbarian-bin-1.01-r3
             │           └─ file ─┤ 903.51 Kb  	 barbarian101_linux.zip

Total: 2 actions (1 unmask, 1 download), grouped into 2 steps.
       903.51 Kb to be downloaded.



>>> Assumptions taken during proving & planning:

  Package unmask (1 package):
  Add to /etc/portage/package.unmask:
    =games-arcade/barbarian-bin-1.01-r3


Error The proof for your build plan contains domain assumptions. Please verify:


>>> Domain assumptions

- REQUIRED_USE violation: 
  media-libs/libsdl
  No ebuild satisfies USE deps for portage://media-libs/libsdl-1.2.78 (use_dep_unsat)
  USE deps force:   [abi_x86_32]
  conflicts with profile use.mask / use.force
  required by: portage://games-arcade/barbarian-bin-1.01-r3

- REQUIRED_USE violation: 
  sys-libs/libstdc++-v3
  No ebuild satisfies USE deps for portage://sys-libs/libstdc++-v3-3.3.6-r5 (use_dep_unsat)
  USE deps force:   [multilib]
  conflicts with profile use.mask / use.force
  required by: portage://games-arcade/barbarian-bin-1.01-r3


>>> Bug report drafts (Gentoo Bugzilla)

---
Summary: portage://games-arcade/barbarian-bin-1.01-r3: unsatisfied_constraints dependency on media-libs/libsdl

Affected package: portage://games-arcade/barbarian-bin-1.01-r3
Dependency: media-libs/libsdl
Phases: [run]

Unsatisfiable constraint(s):
  >=media-libs/libsdl-1.2.15-r4

Observed:
  portage-ng reports no available candidate satisfies the above constraint(s).
  Available versions in repo set (sample, first 2 of 2): [1.2.68,1.2.78]

Potential fix (suggestion):
  Review dependency metadata in portage://games-arcade/barbarian-bin-1.01-r3; constraint set: [constraint(greaterequal,1.2.15-r4,[])].

---
Summary: portage://games-arcade/barbarian-bin-1.01-r3: unsatisfied_constraints dependency on sys-libs/libstdc++-v3

Affected package: portage://games-arcade/barbarian-bin-1.01-r3
Dependency: sys-libs/libstdc++-v3
Phases: [run]

Unsatisfiable constraint(s):
  sys-libs/libstdc++-v3-:5

Observed:
  portage-ng reports no available candidate satisfies the above constraint(s).
  Available versions in repo set (sample, first 2 of 2): [3.3.6-r4,3.3.6-r5]

Potential fix (suggestion):
  Review dependency metadata in portage://games-arcade/barbarian-bin-1.01-r3; constraint set: [constraint(none,,[slot(5)])].