sbclPackages.cl-environments: fix build

    patches = optionals stdenv.isDarwin [ ./patches/cffi-libffi-darwin-ffi-h.patch ];

  };

  cl-environments = super.cl-environments.overrideLispAttrs (old: {

    patches = old.patches or [] ++ [

      # Needed because SB-INT:TRULY-DYNAMIC-EXTENT has been removed since sbcl 2.3.10.

      # The update isn't available on quicklisp yet, but we can fetch from upstream directly

      (pkgs.fetchpatch {

        url = "https://github.com/alex-gutev/cl-environments/commit/1bd7ecf68adeaf654616c6fb763c1239e0f2e221.patch";

        sha256 = "sha256-i6KdthYqPlJPvxM2c2kossHYvXNhpZHl/7NzELNrOHU=";

      })

    ];

  });

  cl-unicode = build-with-compile-into-pwd {

    pname = "cl-unicode";

    version = "0.1.6";