USE flags with which it's built: [ebuild R ] media-gfx/imagemagick-6.6.8.5 USE="X fontconfig jpeg png svg tiff truetype -autotrace -bzip2 -corefonts -cxx -djvu -fftw -fpx -graphviz -gs -hdri -jbig -jpeg2k -lcms -lqr -lzma -openexr -openmp -perl -q32 -q8 -raw -static-libs -webp -wmf -xml -zlib" VIDEO_CARDS="nvidia" 0 kB but «convert -version |grep ^Fe» doesn't show «OpenCL». This is because we have in an imagemagick's ebuild: econf \ … $(use_enable video_cards_nvidia opencl) \ but opencl is disabled due to lack of headers, unless you have installed a dev-util/nvidia-cuda-toolkit manually. The second problem is that there are several opencl implementations. Reproducible: Always
This used to work... but confirming it doesn't anymore.
Works again (more or less copied behavior from wine's ebuild) $ convert -version |grep -i feat Features: OpenMP OpenCL
*** This bug has been marked as a duplicate of bug 322161 ***