Blender fails to emerge, can't seem to get USE flag in there

emerge-blender.txt

# USE=python_targets_python3_5 emerge --nodeps -1 blender


!!! Problem resolving dependencies for media-gfx/blender

!!! The ebuild selected to satisfy "blender" has unmet requirements.
- media-gfx/blender-2.78a-r1::gentoo USE="boost bullet dds doc elbeem ffmpeg fftw game-engine jack jpeg2k nls openexr openmp sdl sndfile tiff -collada -colorio -cuda -cycles -debug -headless -jemalloc -libav -llvm -man -ndof -openal -opencl -openimageio -opensubdiv -openvdb -player -test -valgrind" ABI_X86="64" PYTHON_TARGETS="-python3_5"

  The following REQUIRED_USE flag constraints are unsatisfied:
    python_targets_python3_5

  The above constraints are a subset of the following complete expression:
    python_targets_python3_5 player? ( game-engine !headless ) cuda? ( cycles !opencl ) cycles? ( boost openexr tiff openimageio ) colorio? ( boost ) openvdb? ( boost ) opensubdiv? ( cuda ) nls? ( boost ) openal? ( boost ) opencl? ( cycles ) game-engine? ( boost ) at-most-one-of ( ffmpeg libav )

make-conf.txt

# grep PYTHON /etc/portage/make.conf
PYTHON_SINGLE_TARGET="python2_7"
PYTHON_TARGETS="python2_7 python3_4 python3_5"
USE_PYTHON="2.7 3.3"

package-use.txt

# grep blender /etc/portage/package.use/* | grep -v :#
/etc/portage/package.use/python:media-gfx/blender               python_targets_python3_5