anchor.diff:  # libftdi           # Needed by icestorm to flash netlists
   # mercurial         # Needed by Yosys when installing abc
   # python-pint       # Does unit conversion for statistics like slice usage
  -# sbt               # Builds Chisel
   # scala             # Runs Chisel programs
   # scons             # Builds turborav
   # tcl               # Needed by Yosys
   
   RUN useradd -m -G wheel turbo
   
  -# Install chisel from Maven
  +# Install chisel from the AUR
  +# Don't delete this code. It is handy for the times when it is
  +# necessary to build chisel from source.
  +# USER turbo
  +# ENV CHISEL_REVISION 560d5f37ca60e629def7fc3cae7b3d343893b561
  +# WORKDIR /home/turbo
  +# RUN git clone https://aur.archlinux.org/chisel-git.git \
  +#     && cd chisel-git \
  +#     && sed -i "s chisel\.git chisel\.git#commit=$CHISEL_REVISION " PKGBUILD \
  +#     && makepkg --clean
   # USER root
  -# ENV CHISEL_VERSION 2.2.31
  -# ENV SCALA_VERSION 2.11
  -# ENV CHISEL_JAR chisel_$SCALA_VERSION-$CHISEL_VERSION.jar
  -# RUN curl http://central.maven.org/maven2/edu/berkeley/cs/chisel_$SCALA_VERSION/$CHISEL_VERSION/$CHISEL_JAR > \
  -#     $CHISEL_JAR \
  -#     && install -Dm644 $CHISEL_JAR /usr/share/scala/chisel/chisel.jar
  -
  -# Install chisel from the AUR
  -USER turbo
  -ENV CHISEL_REVISION 560d5f37ca60e629def7fc3cae7b3d343893b561
  -WORKDIR /home/turbo
  -RUN git clone https://aur.archlinux.org/chisel-git.git \
  -    && cd chisel-git \
  -    && sed -i "s chisel\.git chisel\.git#commit=$CHISEL_REVISION " PKGBUILD \
  -    && makepkg --clean
  -USER root
  -RUN pacman -U --noconfirm chisel-git/chisel-git*pkg*
  +# RUN pacman -U --noconfirm chisel-git/chisel-git*pkg*
   
   # Install FPGA synthesis tools from the AUR
   WORKDIR /home/turbo
  
positive.code: RUN pacman -U --noconfirm yosys-git/yosys-git*pkg*
  RUN pacman -U --noconfirm arachne-pnr-git/arachne-pnr-git*pkg*
  
  # Assume user is going to be mounting his local repo at /mnt/turborav
  WORKDIR /mnt/turborav/hw
  USER turbo
  
negative.code:     libftdi \
      mercurial \
      python-pint \
      scala \
      scons \
      tcl \
  