anchor.diff:      && cd oftr/Build \
       && cmake .. \
       && CTEST_OUTPUT_ON_FAILURE=1 make all test install/strip \
  +    && apk add --virtual .oftr-rundeps libgcc libstdc++ libpcap \
       && apk del .build-deps \
       && rm -rf /oftr
   
  
positive.code: 
  MAINTAINER William W. Fisher "william.w.fisher@gmail.com"
  
  # oftr needs libgcc, libstdc++, and libpcap.
  
  RUN apk add --no-cache libgcc libstdc++ libpcap
  
  # Set up build dependencies, then build and install oftr. Clean up when we
  # are done.
  
  RUN set -ex \
      && apk add --no-cache --virtual .build-deps  \
  
negative.code: FROM alpine:3.6
  
  # Usage:
  #
  