diff --git a/Makefile.am b/Makefile.am
index 1060ffe..593fa3b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -12,6 +12,7 @@
 ##  Lesser General Public License for more details.
 ##
 
+DIST_SUBDIRS = lib src po tests debug
 SUBDIRS =
 
 if COND_GNULIB
diff --git a/configure.ac b/configure.ac
index a25b9b0..dbafd73 100644
--- a/configure.ac
+++ b/configure.ac
@@ -646,6 +646,7 @@ AC_CONFIG_FILES([
 	src/lzmadec/Makefile
 	src/scripts/Makefile
 	tests/Makefile
+	debug/Makefile
 ])
 
 AC_OUTPUT
diff --git a/debug/Makefile.am b/debug/Makefile.am
new file mode 100644
index 0000000..b393db3
--- /dev/null
+++ b/debug/Makefile.am
@@ -0,0 +1,30 @@
+##
+##  Copyright (C) 2008 Lasse Collin
+##
+##  This library is free software; you can redistribute it and/or
+##  modify it under the terms of the GNU Lesser General Public
+##  License as published by the Free Software Foundation; either
+##  version 2.1 of the License, or (at your option) any later version.
+##
+##  This library is distributed in the hope that it will be useful,
+##  but WITHOUT ANY WARRANTY; without even the implied warranty of
+##  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+##  Lesser General Public License for more details.
+##
+
+noinst_PROGRAMS = \
+	sync_flush
+
+AM_CPPFLAGS = \
+	-I@top_srcdir@/src/common \
+	-I@top_srcdir@/src/liblzma/api
+
+AM_LDFLAGS = -static
+
+LDADD = \
+	@top_builddir@/src/liblzma/liblzma.la \
+	@LTLIBINTL@
+
+if COND_GNULIB
+LDADD += @top_builddir@/lib/libgnu.a
+endif
diff --git a/debug/README b/debug/README
new file mode 100644
index 0000000..749610d
--- /dev/null
+++ b/debug/README
@@ -0,0 +1,17 @@
+
+Debug tools
+-----------
+
+    This directory contains a few tiny programs that may be helpful when
+    debugging LZMA Utils.
+
+    These tools are not meant to be installed. Often one needs to edit
+    the source code a little to make the programs do the wanted things.
+    If you don't know how these programs could help you, it is likely
+    that they really are useless to you.
+
+    These aren't intended to be used as example programs. They take some
+    shortcuts here and there, which correct programs should not do. Many
+    possible errors (especially I/O errors) are ignored. Don't report
+    bugs or send patches to fix this kind of bugs.
+
diff --git a/debug/sync_flush.c b/debug/sync_flush.c
new file mode 100644
index 0000000..24b8de6
--- /dev/null
+++ b/debug/sync_flush.c
@@ -0,0 +1,116 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       sync_flush.c
+/// \brief      Encode files using LZMA_SYNC_FLUSH
+//
+//  Copyright (C) 2008 Lasse Collin
+//
+//  This library is free software; you can redistribute it and/or
+//  modify it under the terms of the GNU Lesser General Public
+//  License as published by the Free Software Foundation; either
+//  version 2.1 of the License, or (at your option) any later version.
+//
+//  This library is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+//  Lesser General Public License for more details.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "sysdefs.h"
+#include <stdio.h>
+
+
+static lzma_stream strm = LZMA_STREAM_INIT;
+static FILE *file_in;
+
+
+static void
+encode(size_t size, lzma_action action)
+{
+	static const size_t CHUNK = 64;
+	uint8_t in[CHUNK];
+	uint8_t out[CHUNK];
+	lzma_ret ret;
+
+	do {
+		if (strm.avail_in == 0 && size > 0) {
+			const size_t amount = MIN(size, CHUNK);
+			strm.avail_in = fread(in, 1, amount, file_in);
+			strm.next_in = in;
+			size -= amount; // Intentionally not using avail_in.
+		}
+
+		strm.next_out = out;
+		strm.avail_out = CHUNK;
+
+		ret = lzma_code(&strm, size == 0 ? action : LZMA_RUN);
+
+		if (ret != LZMA_OK && ret != LZMA_STREAM_END) {
+			fprintf(stderr, "%s:%u: %s: ret == %d\n",
+					__FILE__, __LINE__, __func__, ret);
+			exit(1);
+		}
+
+		fwrite(out, 1, CHUNK - strm.avail_out, stdout);
+
+	} while (size > 0 || strm.avail_out == 0);
+
+	if ((action == LZMA_RUN && ret != LZMA_OK)
+			|| (action != LZMA_RUN && ret != LZMA_STREAM_END)) {
+		fprintf(stderr, "%s:%u: %s: ret == %d\n",
+				__FILE__, __LINE__, __func__, ret);
+		exit(1);
+	}
+}
+
+
+int
+main(int argc, char **argv)
+{
+	lzma_init_encoder();
+
+	file_in = argc > 1 ? fopen(argv[1], "rb") : stdin;
+
+	// Config
+	lzma_options_lzma opt_lzma = {
+		.dictionary_size = 1 << 16,
+		.literal_context_bits = LZMA_LITERAL_CONTEXT_BITS_DEFAULT,
+		.literal_pos_bits = LZMA_LITERAL_POS_BITS_DEFAULT,
+		.pos_bits = LZMA_POS_BITS_DEFAULT,
+		.preset_dictionary = NULL,
+		.mode = LZMA_MODE_BEST,
+		.fast_bytes = 32,
+		.match_finder = LZMA_MF_BT3,
+		.match_finder_cycles = 0,
+	};
+
+	lzma_options_stream opt_stream = {
+		.check = LZMA_CHECK_NONE,
+		.has_crc32 = false,
+		.uncompressed_size = LZMA_VLI_VALUE_UNKNOWN,
+		.alignment = 0,
+	};
+	opt_stream.filters[0].id = LZMA_FILTER_LZMA;
+	opt_stream.filters[0].options = &opt_lzma;
+	opt_stream.filters[1].id = LZMA_VLI_VALUE_UNKNOWN;
+
+	// Init
+	if (lzma_stream_encoder_single(&strm, &opt_stream) != LZMA_OK) {
+		fprintf(stderr, "init failed\n");
+		exit(1);
+	}
+
+	// Encoding
+	encode(0, LZMA_SYNC_FLUSH);
+	encode(6, LZMA_SYNC_FLUSH);
+	encode(0, LZMA_SYNC_FLUSH);
+	encode(6, LZMA_SYNC_FLUSH);
+	encode(0, LZMA_SYNC_FLUSH);
+	encode(0, LZMA_FINISH);
+
+	// Clean up
+	lzma_end(&strm);
+
+	return 0;
+}