anchor.diff:  
     src = fetchurl {
       url = "mirror://sourceforge/${name}/${name}-${version}.tar.gz";
  -    sha256 = "1dw9vfzldpj7lv303xbw0wpyn6ra6i2yzwlrjbcx7j0jm5n43ji0";
  +    sha256 = "1wwqvay9z6gal7bsyyyhhcwh0fy5ak4h2a446ali0x6zmybaklcy";
     };
   
     buildInputs = [sbcl texinfo perl makeWrapper];
  
positive.code: 
  let
    name    = "maxima";
    version = "5.34.1";
  
    searchPath =
      stdenv.lib.makeSearchPath "bin"
  
negative.code:     ln -s ../maxima/${version}/doc $out/share/doc/maxima
    '';
  
    # Failures in the regression test suite won't abort the build process. We run
    # the suite only so that potential errors show up in the build log. See also:
    # http://sourceforge.net/tracker/?func=detail&aid=3365831&group_id=4933&atid=104933.
    doCheck = true;
  
    enableParallelBuilding = true;
  