anchor.diff:                  python3-gdal
   
   #
  -# Build python-mapnik (PPA is broken)
  +# Build python-mapnik form source, since Mapnik's pip package only supports python2,
  +# and their official PPA is broken.  Hopefully this will be fixed in ubuntu-16.04
   #
  -
  -# NOTE : Requires at least 8GB memory for 2 cores and 16GB on 4 cores,
  -#        through 16 cores requires only 32GB memory.
  +# WARNING: Very slow!!!, and memory hungry using GCC:
  +#   - 1~2 cores: 8GB
  +#   - 4~8 cores: 16GB
  +#   - >=16 cores: 32GB
  +#
  +# Requires freetype2.6 otherwise Google Noto CJK fonts don't get auto hinting.
   
   WORKDIR     /tmp
   
   ENV         FREETYPE_VERSION=VER-2-6-1 \
               MAPNIK_VERSION=v3.0.8
   
  +# Fixes https://github.com/mapnik/mapnik/issues/3090
   COPY        3090-fix.diff ./
  -
   
   RUN         set -x \
               && DEV_PACKAGES="python3-cairo-dev \
  
positive.code:                 libboost-system-dev \
                  libboost-thread-dev \
                  libz-dev \
                  libharfbuzz-dev \
                  libwebp-dev \
                  liblcms2-dev  \
                  libjpeg-dev \
                  libtiff-dev \
                  libproj-dev \
                  libgeos-dev \
                  libgdal-dev \
                  libicu-dev \
                  libfreetype6-dev \
                  libsqlite3-dev \
                  libpq-dev \
  
negative.code:                 python3-skimage \
                  python3-pylibmc \
                  python3-pil \
                  libwebp5 \
                  libpng3 \
                  libjpeg62 \
                  libtiff5 \
                  imagemagick \
                  cython3 \
                  gdal-bin \
  