anchor.diff:    ghc7_8 = overrideForGhc7_8 (extendHaskellPackages nixpkgs.pkgs.haskell.packages.ghc784);
     ghcIosSimulator64 = overrideForGhcIOS (extendHaskellPackages nixpkgsCross.ios.simulator64.pkgs.haskell.packages.ghcCross);
     ghcIosArm64 = overrideForGhcIOS (extendHaskellPackages nixpkgsCross.ios.arm64.pkgs.haskell.packages.ghcCross);
  +  ghcIosArmv7 = overrideForGhcIOS (extendHaskellPackages nixpkgsCross.ios.armv7.pkgs.haskell.packages.ghcCross);
   in let this = rec {
     overrideForGhcjs = haskellPackages: haskellPackages.override {
       overrides = self: super: {
  
positive.code:           };
            inherit config;
          };
        };
      };
      lib = import (nixpkgs.path + "/pkgs/development/haskell-modules/lib.nix") { pkgs = nixpkgs; };
  
negative.code:             postFixup = ''
                  mkdir $out/reflex-todomvc.app
                  cp reflex-todomvc.app/* $out/reflex-todomvc.app/
                  cp $out/bin/reflex-todomvc $out/reflex-todomvc.app/
              '';
          });
          happy = self.ghc.bootPkgs.happy;
          # Disabled until we can figure out how to build reflex-todomvc setup with host GHC
  