anchor.diff: -{ stdenv, lib, fetchFromGitHub, pkg-config, libffi, python3, readline }:
  +{ stdenv
  +, lib
  +, fetchFromGitHub
  +, fetchpatch
  +, pkg-config
  +, libffi
  +, python3
  +, readline
  +}:
   
   stdenv.mkDerivation rec {
     pname = "micropython";
  
positive.code:   meta = with lib; {
      description = "A lean and efficient Python implementation for microcontrollers and constrained systems";
      homepage = "https://micropython.org";
      platforms = [ "x86_64-linux" ];
      license = licenses.mit;
      maintainers = with maintainers; [ sgo ];
    };
  
negative.code:     fetchSubmodules = true;
    };
  
    # drop the following patches when upgrading to 1.16
    patches = [
      # fix build with modern clang https://github.com/micropython/micropython/pull/7254
      (fetchpatch {
        url = "https://github.com/micropython/micropython/commit/126b1c727118352923703719a2a3d45b9fad3c97.patch";
        sha256 = "13a2bmz24syhd1qsqbx39dcjkjdhf05ln7lanh816m94lkfib21j";
      })
      # fix build with modern clang https://github.com/micropython/micropython/pull/7254
      (fetchpatch {
        url = "https://github.com/micropython/micropython/commit/7ceccad4e2f1e9d073f5781c32e5b377e8391a25.patch";
        sha256 = "04mbxmb5yr6pbhhf9villq8km4wy579r46v9p4n0ysivrxij7i6f";
      })
      # fix build on aarch64-darwin https://github.com/micropython/micropython/pull/7393
      (fetchpatch {
        url = "https://github.com/micropython/micropython/commit/95048129b1d93854c25f501c02801929aeeb23f0.patch";
        sha256 = "1cngcwq4jviyhdnfcrrkdadfikhffzbj0d634j0344cp247jb41n";
      })
    ];
  
    nativeBuildInputs = [ pkg-config python3 ];
  
    buildInputs = [ libffi readline ];
  
    buildPhase = ''
      runHook preBuild
      make -C mpy-cross
      make -C ports/unix
      runHook postBuild
    '';
  
    doCheck = true;
  
    skippedTests = ""
      + lib.optionalString (stdenv.isDarwin) " -e uasyncio_basic -e uasyncio_wait_task"
      + lib.optionalString (stdenv.isDarwin && stdenv.isAarch64) " -e ffi_callback"
      + lib.optionalString (stdenv.isLinux && stdenv.isAarch64) " -e float_parse"
    ;
  
    checkPhase = ''
      runHook preCheck
      pushd tests
      ${python3.interpreter} ./run-tests.py ${skippedTests}
      popd
      runHook postCheck
    '';
  
    installPhase = ''
  