anchor.diff:        "x86_64-linux" = fetchurl {
             url = http://www.eclipse.org/downloads/download.php?r=1&nf=1&file=/eclipse/downloads/drops4/R-4.5-201506032000/eclipse-SDK-4.5-linux-gtk-x86_64.tar.gz;
             sha256 = "0vfql4gh263ms8bg7sgn05gnjajplx304cn3nr03jlacgr3pkarf";
  -
           };
         "i686-linux" = fetchurl {
             url = http://www.eclipse.org/downloads/download.php?r=1&nf=1&file=/eclipse/downloads/drops4/R-4.5-201506032000/eclipse-SDK-4.5-linux-gtk.tar.gz;
  
positive.code:     description = "Eclipse platform";
      sources = {
        "x86_64-linux" = fetchurl {
            url = "https://www.eclipse.org/downloads/download.php?r=1&nf=1&file=/eclipse/downloads/drops4/R-4.5-201506032000/eclipse-platform-4.5-linux-gtk-x86_64.tar.gz";
            sha256 = "1510j41yr86pbzwf48kjjdd46nkpkh8zwn0hna0cqvsw1gk2vqcg";
  
          };
        "i686-linux" = fetchurl {
            url = "https://www.eclipse.org/downloads/download.php?r=1&nf=1&file=/eclipse/downloads/drops4/R-4.5-201506032000/eclipse-platform-4.5-linux-gtk.tar.gz";
            sha256 = "1f97jd3qbi3830y3djk8bhwzd9whsq8gzfdk996chxc55prn0qbd";
          };
      };
  
negative.code:       "x86_64-linux" = fetchurl {
            url = http://www.eclipse.org/downloads/download.php?r=1&nf=1&file=/eclipse/downloads/drops4/R-4.4.2-201502041700/eclipse-SDK-4.4.2-linux-gtk-x86_64.tar.gz;
            sha256 = "0g00alsixfaakmn4khr0m9fxvkrbhbg6qqfa27xr6a9np6gzg98l";
          };
        "i686-linux" = fetchurl {
            url = http://www.eclipse.org/downloads/download.php?r=1&nf=1&file=/eclipse/downloads/drops4/R-4.4.2-201502041700/eclipse-SDK-4.4.2-linux-gtk.tar.gz;
  