anchor.diff:  {stdenv, fetchurl
  -  , freeglut, ghostscriptX, imagemagick, fftw 
  +  , freeglut, ghostscriptX, imagemagick, fftw
     , boehmgc, libGLU, libGL, mesa_noglu, ncurses, readline, gsl, libsigsegv
     , python, zlib, perl, texLive, texinfo, xz
   , darwin
  
positive.code:     description =  "A tool for programming graphics intended to replace Metapost";
      license = licenses.gpl3Plus;
      maintainers = [ maintainers.raskin maintainers.peti ];
      platforms = platforms.linux ++ platforms.darwin;
    };
  }
  
negative.code: 
    preConfigure = ''
      export HOME="$PWD"
      patchShebangs .
      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/
  