anchor.diff:    };
     buildInputs = [
      freeglut ghostscriptX imagemagick fftw 
  -   boehmgc mesa ncurses readline gsl libsigsegv
  +   boehmgc mesa_glu mesa_noglu mesa_noglu.osmesa ncurses readline gsl libsigsegv
      python zlib perl texLive texinfo xz
     ];
   in
  
positive.code:     sed -e 's@epswrite@eps2write@g' -i runlabel.in
      xz -d < ${texinfo.src} | tar --wildcards -x texinfo-'*'/doc/texinfo.tex
      cp texinfo-*/doc/texinfo.tex doc/
      export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -I${boehmgc}/include/gc"
    '';
  
    postInstall = ''
      mv -v "$out/share/info/asymptote/"*.info $out/share/info/
  
negative.code: {stdenv, fetchurl
    , freeglut, ghostscriptX, imagemagick, fftw 
    , boehmgc, mesa_glu, mesa_noglu, ncurses, readline, gsl, libsigsegv
    , python, zlib, perl, texLive, texinfo, xz
  }:
  let
  