anchor.diff:  ENV CC icc
   ENV CXX icpc
   ENV LDSHARED icc -shared
  -ENV CFLAGS -O3 -g -fPIC -xAVX -axMIC-AVX512 -std=gnu99 -pthread
  -ENV CXXFLAGS -O3 -g -fPIC -xAVX -axMIC-AVX512 -std=c++11 -pthread
  +ENV CFLAGS -O3 -g -fPIC -std=gnu99 -pthread -march=ivybridge -ax=haswell,knl
  +ENV ARCH_FLAGS ""
  +#ENV CFLAGS -O3 -g -fPIC -xAVX -axMIC-AVX512 -std=gnu99 -pthread
  +#ENV CXXFLAGS -O3 -g -fPIC -xAVX -axMIC-AVX512 -std=c++11 -pthread
   
   # Pip installs
   RUN for x in \
  
positive.code: 
  RUN cd /src/legacypipe/py && git pull && git describe && echo 4
  
  #RUN pip3 install cython
  
negative.code:     git \
      file \
      pkg-config \
      gdb \
      less \
      wget \
      netpbm \
      wcslib-dev \
  