The ebuild has a RDEPEND on colorio? ( <=media-libs/opencolorio-1.0.9 ) which obviously leads to a downgrade with opencolorio-1.0.9-r1 [ebuild R ~] media-gfx/blender-2.72b-r3::gentoo USE="boost bullet collada colorio cycles dds doc* ffmpeg fftw jack jpeg2k ndof nls openal openexr openimageio openmp sdl sndfile tiff -debug -elbeem -game-engine -libav -opennl -player -redcode" CPU_FLAGS_X86="sse sse2" PYTHON_TARGETS="python3_4" 0 KiB [ebuild UD ] media-libs/opencolorio-1.0.8::gentoo [1.0.9-r1::gentoo] USE="doc opengl python (-pdf) {-test}" CPU_FLAGS_X86="sse2" PYTHON_TARGETS="python2_7" 11.634 KiB Reproducible: Always Steps to Reproduce: 1. USE+=colorio 2. emerge -jatv blender 3. ;_; Expected Results: Blender should compile happily.
This is not a bug... this is a build restriction. The depgraph is fine.