anchor.diff:  	tar \
   	wget \
   	libssl-dev \
  +	libevent-dev \
  +	libevent-2.0-5 \
   	libexpat1-dev \
   	dnsutils \
   	&& wget http://www.unbound.net/downloads/unbound-1.5.4.tar.gz -P /usr/local/src/ \
  
positive.code: 	&& tar -xvf unbound-1.5.4.tar.gz \
  	&& rm unbound-1.5.4.tar.gz \
  	&& cd unbound-1.5.4 \
  	&& ./configure --prefix=/usr/local \
  	&& make \
  	&& make install \
  	&& cd ../ \
  
negative.code: 	&& apt-get remove -y \
  	build-essential \
  	libssl-dev \
  	libevent-dev \
  	libexpat1-dev \
  	&& apt-get autoremove --purge -y \
  	&& apt-get clean
  