anchor.diff:      http://cran.fyxm.net/
       http://r.adu.org.za/
       http://cran.mirror.ac.za/
  +    http://ftp.cixug.es/CRAN/
       http://cran.es.r-project.org/
       http://ftp.sunet.se/pub/lang/CRAN/
       http://stat.ethz.ch/CRAN/
  -    http://cran.cs.pu.edu.tw/
  +    http://ftp.yzu.edu.tw/CRAN/
       http://cran.csie.ntu.edu.tw/
       http://mirrors.psu.ac.th/pub/cran/
       http://cran.pau.edu.tr/
       http://www.stats.bris.ac.uk/R/
  +    http://mirrors.ebi.ac.uk/CRAN/
       http://cran.ma.imperial.ac.uk/
  +    http://mirror.mdx.ac.uk/R/
       http://star-www.st-andrews.ac.uk/cran/
       http://cran.cnr.berkeley.edu/
       http://cran.stat.ucla.edu/
  
positive.code:   cran = [
      http://cran.r-project.org/
      http://cran.rstudio.com/
      http://mirror.fcaglp.unlp.edu.ar/CRAN/
      http://r.mirror.mendoza-conicet.gob.ar/
      http://cran.csiro.au/
      http://cran.ms.unimelb.edu.au/
      http://cran.at.r-project.org/
      http://www.freestatistics.org/cran/
      http://cran-r.c3sl.ufpr.br/
      http://cran.fiocruz.br/
      http://www.vps.fmvz.usp.br/CRAN/
      http://brieger.esalq.usp.br/CRAN/
      http://cran.stat.sfu.ca/
      http://mirror.its.dal.ca/cran/
      http://probability.ca/cran/
      http://cran.skazkaforyou.com/
      http://cran.parentingamerica.com/
      http://dirichlet.mat.puc.cl/
  
negative.code:     http://cran.cs.wwu.edu/
      http://camoruco.ing.uc.edu.ve/cran/
      http://cran.vinastat.com/
    ];
  
    # Hackage mirrors
  