anchor.diff: -{ stdenv, fetchFromGitHub, cgal, boost, gmp, mpfr, flex, bison, dxflib, readline
  +{ stdenv, fetchFromGitHub, fetchurl, cgal, boost, gmp, mpfr, flex, bison, dxflib, readline
   , qtbase, qmakeHook, mesa_glu
   }:
   
  
positive.code:     maintainers = [ maintainers.raskin ];
      platforms = platforms.linux;
      description = ''Constructive solid geometry package'';
      broken = true; # redefines template instance added in Qt 5.6
    };
  }
  
negative.code:     sha256 = "0a0sqf6h227zalh0jrz6jpm8iwji7q3i31plqk76i4qm9vsgrhir";
    };
  
    patches = [
      (fetchurl {
        url = "https://github.com/GilesBathgate/RapCAD/commit/278a8d6c7b8fe08f867002528bbab4a6319a7bb6.patch";
        sha256 = "1vvkyf0wg79zdzs5zlggfrr1lrp1x75dglzl0mspnycwldsdwznj";
        name = "disable-QVector-qHash.patch";
      })
    ];
  
    nativeBuildInputs = [ qmakeHook ];
    buildInputs = [ qtbase cgal boost gmp mpfr flex bison dxflib readline mesa_glu ];
  
  