diffutils: 3.9 -> 3.10

stdenv.mkDerivation rec {

  pname = "diffutils";

  version = "3.9";

  version = "3.10";

  src = fetchurl {

    url = "mirror://gnu/diffutils/diffutils-${version}.tar.xz";

    hash = "sha256-2A076QogGGjeg9eNrTQTrYgWDMU7zDbrnq98INvwI/E=";

    hash = "sha256-kOXpPMck5OvhLt6A3xY0Bjx6hVaSaFkZv+YLVWyb0J4=";

  };

  patches = [

    # Backport of a fix for 'diff -D' output.

    # TODO: remove when updating to 3.10.

    ./fix-diff-D.patch

  ];

  postPatch = ''

    # avoid the need for help2man

    # TODO: can be removed when fix-diff-D.patch is removed.

    touch man/diff.1

  '';

  outputs = [ "out" "info" ];

  nativeBuildInputs = [ xz.bin ];

  nativeBuildInputs = [ (lib.getBin xz) ];

  /* If no explicit coreutils is given, use the one from stdenv. */

  buildInputs = [ coreutils ];

    lib.optional (coreutils != null) "PR_PROGRAM=${coreutils}/bin/pr"

    ++ lib.optional (stdenv.buildPlatform != stdenv.hostPlatform) "gl_cv_func_getopt_gnu=yes";

  doCheck = true;

  meta = with lib; {

    homepage = "https://www.gnu.org/software/diffutils/diffutils.html";

    description = "Commands for showing the differences between files (diff, cmp, etc.)";

    license = licenses.gpl3;

    platforms = platforms.unix;

    maintainers = with maintainers; [ das_j ];

  };

}

https://git.savannah.gnu.org/cgit/diffutils.git/patch/?id=ba08fbbb0ca5da455bf695236c57bc50e7faed50

https://github.com/NixOS/nixpkgs/pull/213421#issuecomment-1407749912

Fix 'diff -D' regression

--- a/src/diff.c

+++ b/src/diff.c

@@ -416,7 +416,7 @@ main (int argc, char **argv)

 	    char *base = b;

 	    int changes = 0;

-	    for (i = 0; i < sizeof sizeof C_ifdef_group_formats; i++)

+	    for (i = 0; i < sizeof C_ifdef_group_formats; i++)

 	      {

 		char ch = C_ifdef_group_formats[i];

 		switch (ch)