anchor.diff:  # NumPy needs (a line of) patching to link against musl.
   ADD numpy-musl.patch /tmp/numpy-musl.patch
   
  -# Packages needed to build NumPy and SciPy.
  +# Packages needed to build NumPy and SciPy, with runtime dependencies
  +# explicitely named (so they do not get removed during clean up).
   RUN apk add --no-cache \
           fortify-headers \
           g++ \
           gcc \
           gfortran \
           libc-dev \
  +        libstdc++ \
           musl-dev \
           openblas@testing \
           openblas-dev@testing \
  
positive.code: 
  MAINTAINER wrwrwr <docker@wr.waw.pl>
  
  EXPOSE 8192
  
  # We need the testing repository for OpenBLAS and its dependencies.
  
negative.code:         gfortran \
          libc-dev \
          musl-dev \
          openblas-dev \
          pkgconf \
          pkgconfig \
  # Clean up (apk and pip caches, NumPy sources, precompiled bytecode).
  