anchor.diff:  
     libXmu = super.libXmu.overrideAttrs (attrs: {
       outputs = [ "out" "dev" "doc" ];
  -    buildFlags = ''BITMAP_DEFINES=-DBITMAPDIR=\"/no-such-path\"'';
  +    buildFlags = [ "BITMAP_DEFINES='-DBITMAPDIR=\"/no-such-path\"'" ];
     });
   
     libXrandr = super.libXrandr.overrideAttrs (attrs: {
  
positive.code:     outputs = [ "out" "dev" ];
      propagatedBuildInputs = [ freetype ]; # propagate link reqs. like bzip2
      # prevents "misaligned_stack_error_entering_dyld_stub_binder"
      configureFlags = lib.optionals isDarwin [
        "CFLAGS=-O0"
      ];
    });
  
    libXxf86vm = super.libXxf86vm.overrideAttrs (attrs: {
  
negative.code:     x11BuildHook = ./imake.sh;
      patches = [./imake.patch ./imake-cc-wrapper-uberhack.patch];
      setupHook = ./imake-setup-hook.sh;
      CFLAGS = "-DIMAKE_COMPILETIME_CPP='\"${if stdenv.isDarwin
        then "${tradcpp}/bin/cpp"
        else "gcc"}\"'";
  
      inherit tradcpp;
    });
  
  