anchor.diff:  FROM registry.services.nersc.gov/nersc/intel_cxx_fort_mpi_mkl_devel as builder
   
  -RUN apt -y update && apt install -y apt-utils && echo 3
  +RUN apt -y update && apt install -y apt-utils
   
   RUN DEBIAN_FRONTEND=noninteractive \
       apt install -y --no-install-recommends \
  
positive.code:     conda config --add channels intel && \
      conda config --set always_yes yes && \
      conda update conda && \
      conda install python=3.7 pip numpy scipy && \
      conda clean -a -y
  
  # ugly: Tractor's mp_fourier module detects the $CC='icc' exactly
  
negative.code: ENV LDSHARED icc -shared
  # Edison & Cori
  #ENV CFLAGS -O3 -g -fPIC -std=gnu99 -pthread -x=ivybridge -ax=haswell,knl
  # Just Cori (KNL & Haswell)
  ENV CFLAGS -O3 -g -fPIC -std=gnu99 -pthread -x=haswell -ax=knl
  # Just Cori Haswell
  ENV CFLAGS -O3 -g -fPIC -std=gnu99 -pthread -x=haswell
  ENV ARCH_FLAGS ""
  
  ENV PYTHON python3
  