anchor.diff:  
   ### alphabetically sorted builds from source
   
  -### install bowtie2 2.3.5
  +### install latest bowtie2 release
   RUN cd /root \
  -		&& wget -O bowtie2.zip https://github.com/BenLangmead/bowtie2/releases/download/v2.3.5/bowtie2-2.3.5-linux-x86_64.zip \
  -    && unzip bowtie2.zip \
  -    && rm -f bowtie2.zip \
  -    && cd bowtie2-* \
  +		&& 	curl -s https://api.github.com/repos/BenLangmead/bowtie2/releases/latest  \
  +		| grep tarball_url | cut -f4 -d\" | wget -O download.tar.gz -qi - \
  +		&& tar xzfp download.tar.gz \
  +    && rm -f download.tar.gz \
  +    && cd * \
  +    && make \
       && install bowtie2* /usr/local/bin/ \
       && cd /root \
       && rm -rf bowtie2*
  
positive.code: # MG-RAST pipeline Dockerfile
  
  FROM ubuntu
  MAINTAINER The MG-RAST team (folker@mg-rast.org)
  ARG DEBIAN_FRONTEND=noninteractive
  
  
negative.code:     && make clean \
      && cd /root ; rm -rf skewer
  
  ### install latest vsearch release
  RUN cd /root \
  		&& curl -s https://api.github.com/repos/torognes/vsearch/releases/latest  \
  		| grep tarball_url | cut -f4 -d\" | wget -O download.tar.gz -qi - \
  		&& tar xzfp download.tar.gz \
  		&& rm -f download.tar.gz \
  		&& cd * \
  		&& sh ./autogen.sh \
  		&& ./configure --prefix=/usr/local/ \
  		&& make \
  