anchor.diff:  
   RUN           ls -lsa               /usr/local/bin ${SRC}
   RUN           /usr/local/bin/ffmpeg
  +
  +
  +ENTRYPOINT    ["ffmpeg"]
  +CMD           ["--help"]
  
positive.code: ENV           YASM_VERSION   1.2.0
  ENV           LAME_VERSION   3.99.5
  ENV           FAAC_VERSION   1.28
  
  ENV           SRC            /opt/src
  
  
  
negative.code:               make distclean
  
  
  # faac + http://stackoverflow.com/a/4320377
  RUN           cd ${SRC} && \
                curl -L -O  http://downloads.sourceforge.net/faac/faac-${FAAC_VERSION}.tar.gz  && \
                tar xzvf faac-${FAAC_VERSION}.tar.gz  && \
                cd faac-${FAAC_VERSION} && \
                sed -i '126d' common/mp4v2/mpeg4ip.h && \
                ./bootstrap && \
                ./configure && \
                make && \
                make install && \
                ldconfig
  
  # xvid
  RUN           cd ${SRC} && \
                curl -L -O  http://downloads.xvid.org/downloads/xvidcore-${XVID_VERSION}.tar.gz  && \
                tar xzvf xvidcore-${XVID_VERSION}.tar.gz && \
                cd xvidcore/build/generic && \
                ./configure && \
                make && \
                make install && \
                ldconfig
  
  
  
  # ffmpeg
  RUN           cd ${SRC} && \
                curl -O http://ffmpeg.org/releases/ffmpeg-${FFMPEG_VERSION}.tar.bz2 && \
                tar xjvf ffmpeg-${FFMPEG_VERSION}.tar.bz2
                cd ffmpeg-${FFMPEG_VERSION} && \
                PKG_CONFIG_PATH="${SRC}/lib/pkgconfig" && \
                export PKG_CONFIG_PATH && \
                ./configure --prefix="${SRC}" --extra-cflags="-I${SRC}/include" --extra-ldflags="-L${SRC}/lib" --bindir="/usr/local/bin" \
  