anchor.diff:      if stdenv.isi686
       then fetchurl {
         url = "mirror://gnu/mit-scheme/stable.pkg/${version}/mit-scheme-${version}-i386.tar.gz";
  -      sha256 = "0vi760fy550d9db538m0vzbq1mpdncvw9g8bk4lswk0kcdira55z";
  +      sha256 = "1fmlpnhf5a75db93phajh4ysbdgrgl72v45lk3kznriprl0a7jc6";
       } else if stdenv.isx86_64
       then fetchurl {
         url = "mirror://gnu/mit-scheme/stable.pkg/${version}/mit-scheme-${version}-x86-64.tar.gz";
  -      sha256 = "1wcxm9hyfc53myvlcn93fyqrnnn4scwkknl9hkbp1cphc6mp291x";
  +      sha256 = "1skzxxhr0iq96bf0j5m7mvf3i4sppfyfa6gpqn34mwgkw1fx8274";
       } else fetchurl {
         url = "mirror://gnu/mit-scheme/stable.pkg/${version}/mit-scheme-c-${version}.tar.gz";
  -      sha256 = "0pclakzwxbqgy6wqwvs6ml62wgby8ba8xzmwzdwhx1v8wv05yw1j";
  +      sha256 = "0w5ib5vsidihb4hb6fma3sp596ykr8izagm57axvgd6lqzwicsjg";
       };
   
     configurePhase =
  
positive.code: { fetchurl, stdenv, makeWrapper, gnum4, texinfo, texLive, automake }:
  
  let
    version = "9.1.1";
    bootstrapFromC = ! (stdenv.isi686 || stdenv.isx86_64);
  
    arch = if      stdenv.isi686   then "-i386"
  
negative.code: 
      homepage = http://www.gnu.org/software/mit-scheme/;
  
      license = licenses.gpl2Plus;
  
      maintainers = with maintainers; [ ludo ];
  
      # Build fails on Cygwin and Darwin:
      # <http://article.gmane.org/gmane.lisp.scheme.mit-scheme.devel/489>.
      platforms = platforms.gnu ++ platforms.freebsd;
    };
  }
  