anchor.diff:    };
   
     packagesWithNativeBuildInputs = {
  -    abn = [ pkgs.gsl ];
  +    abn = [ pkgs.gsl_1 ];
       adimpro = [ pkgs.imagemagick ];
       audio = [ pkgs.portaudio ];
  -    BayesSAE = [ pkgs.gsl ];
  -    BayesVarSel = [ pkgs.gsl ];
  +    BayesSAE = [ pkgs.gsl_1 ];
  +    BayesVarSel = [ pkgs.gsl_1 ];
       BayesXsrc = [ pkgs.readline pkgs.ncurses ];
       bigGP = [ pkgs.openmpi ];
       BiocCheck = [ pkgs.which ];
       Biostrings = [ pkgs.zlib ];
  -    bnpmr = [ pkgs.gsl ];
  -    BNSP = [ pkgs.gsl ];
  +    bnpmr = [ pkgs.gsl_1 ];
  +    BNSP = [ pkgs.gsl_1 ];
       cairoDevice = [ pkgs.gtk2 ];
       Cairo = [ pkgs.libtiff pkgs.libjpeg pkgs.cairo ];
       Cardinal = [ pkgs.which ];
       chebpol = [ pkgs.fftw ];
       ChemmineOB = [ pkgs.openbabel pkgs.pkgconfig ];
  -    cit = [ pkgs.gsl ];
  +    cit = [ pkgs.gsl_1 ];
       curl = [ pkgs.curl ];
       devEMF = [ pkgs.xorg.libXft ];
  -    diversitree = [ pkgs.gsl pkgs.fftw ];
  +    diversitree = [ pkgs.gsl_1 pkgs.fftw ];
       EMCluster = [ pkgs.liblapack ];
       fftw = [ pkgs.fftw ];
       fftwtools = [ pkgs.fftw ];
       Formula = [ pkgs.gmp ];
  -    geoCount = [ pkgs.gsl ];
  +    geoCount = [ pkgs.gsl_1 ];
       git2r = [ pkgs.zlib pkgs.openssl ];
  -    GLAD = [ pkgs.gsl ];
  +    GLAD = [ pkgs.gsl_1 ];
       glpkAPI = [ pkgs.gmp pkgs.glpk ];
       gmp = [ pkgs.gmp ];
  -    graphscan = [ pkgs.gsl ];
  -    gsl = [ pkgs.gsl ];
  -    HiCseg = [ pkgs.gsl ];
  -    iBMQ = [ pkgs.gsl ];
  +    graphscan = [ pkgs.gsl_1 ];
  +    gsl = [ pkgs.gsl_1 ];
  +    HiCseg = [ pkgs.gsl_1 ];
  +    iBMQ = [ pkgs.gsl_1 ];
       igraph = [ pkgs.gmp ];
       JavaGD = [ pkgs.jdk ];
       jpeg = [ pkgs.libjpeg ];
  -    KFKSDS = [ pkgs.gsl ];
  +    KFKSDS = [ pkgs.gsl_1 ];
       kza = [ pkgs.fftw ];
  -    libamtrack = [ pkgs.gsl ];
  -    mixcat = [ pkgs.gsl ];
  -    mvabund = [ pkgs.gsl ];
  +    libamtrack = [ pkgs.gsl_1 ];
  +    mixcat = [ pkgs.gsl_1 ];
  +    mvabund = [ pkgs.gsl_1 ];
       mwaved = [ pkgs.fftw ];
       ncdf4 = [ pkgs.netcdf ];
       ncdf = [ pkgs.netcdf ];
       nloptr = [ pkgs.nlopt ];
       openssl = [ pkgs.openssl ];
  -    outbreaker = [ pkgs.gsl ];
  +    outbreaker = [ pkgs.gsl_1 ];
       pander = [ pkgs.pandoc pkgs.which ];
       pbdMPI = [ pkgs.openmpi ];
       pbdNCDF4 = [ pkgs.netcdf ];
  
positive.code:     proj4 = [ pkgs.proj ];
      qtbase = [ pkgs.qt4 ];
      qtpaint = [ pkgs.qt4 ];
      R2GUESS = [ pkgs.gsl ];
      R2SWF = [ pkgs.zlib pkgs.libpng pkgs.freetype ];
      RAppArmor = [ pkgs.libapparmor ];
      rapportools = [ pkgs.which ];
  
negative.code:     SAVE = [ pkgs.zlib pkgs.bzip2 pkgs.icu pkgs.lzma pkgs.pcre ];
      sdcTable = [ pkgs.gmp pkgs.glpk ];
      seewave = [ pkgs.fftw pkgs.libsndfile ];
      SemiCompRisks = [ pkgs.gsl_1 ];
      seqinr = [ pkgs.zlib ];
      seqminer = [ pkgs.zlib pkgs.bzip2 ];
      showtext = [ pkgs.zlib pkgs.libpng pkgs.icu pkgs.freetype ];
      simplexreg = [ pkgs.gsl_1 ];
      SOD = [ pkgs.cudatoolkit ]; # requres CL/cl.h
      spate = [ pkgs.fftw ];
      sprint = [ pkgs.openmpi ];
      ssanv = [ pkgs.proj ];
      stsm = [ pkgs.gsl_1 ];
      stringi = [ pkgs.icu ];
      survSNP = [ pkgs.gsl_1 ];
      sysfonts = [ pkgs.zlib pkgs.libpng pkgs.freetype ];
      TAQMNGR = [ pkgs.zlib ];
      tiff = [ pkgs.libtiff ];
      TKF = [ pkgs.gsl_1 ];
      tkrplot = [ pkgs.xorg.libX11 ];
      topicmodels = [ pkgs.gsl_1 ];
      udunits2 = [ pkgs.udunits pkgs.expat ];
      V8 = [ pkgs.v8 ];
      VBLPCM = [ pkgs.gsl_1 ];
      VBmix = [ pkgs.gsl_1 pkgs.fftw pkgs.qt4 ];
      WhopGenome = [ pkgs.zlib ];
      XBRL = [ pkgs.zlib pkgs.libxml2 ];
      xml2 = [ pkgs.libxml2 ];
  