$ tesseract -v tesseract 3.05.01 leptonica-1.74.4 libgif 5.1.4 : libjpeg 6b (libjpeg-turbo 1.5.1) : libpng 1.6.29+apng : libtiff 4.0.8 : zlib 1.2.11 : libwebp 0.5.2 OpenCL info: Found 1 platform(s). Platform 1 name: Clover. Version: OpenCL 1.1 Mesa 17.2.8. Found 1 device(s). Device 1 name: AMD CARRIZO (DRM 3.23.0 / 4.15.6-gentoo, LLVM 5.0.1).