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diff --git a/subversion/include/private/svn_diff_private.h b/subversion/include/private/svn_diff_private.h
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+++ b/subversion/include/private/svn_diff_private.h
@@ -0,0 +1,115 @@
+/**
+ * @copyright
+ * ====================================================================
+ *    Licensed to the Apache Software Foundation (ASF) under one
+ *    or more contributor license agreements.  See the NOTICE file
+ *    distributed with this work for additional information
+ *    regarding copyright ownership.  The ASF licenses this file
+ *    to you under the Apache License, Version 2.0 (the
+ *    "License"); you may not use this file except in compliance
+ *    with the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing,
+ *    software distributed under the License is distributed on an
+ *    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *    KIND, either express or implied.  See the License for the
+ *    specific language governing permissions and limitations
+ *    under the License.
+ * ====================================================================
+ * @endcopyright
+ */
+
+
+#ifndef SVN_DIFF_PRIVATE_H
+#define SVN_DIFF_PRIVATE_H
+
+#include <apr_pools.h>
+#include <apr_tables.h>
+
+#include "svn_types.h"
+#include "svn_io.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+
+
+/* The separator string used below the "Index:" or similar line of
+ * Subversion's Unidiff-like diff format.  */
+#define SVN_DIFF__EQUAL_STRING \
+  "==================================================================="
+
+/* The separator string used below the "Properties on ..." line of
+ * Subversion's Unidiff-like diff format.  */
+#define SVN_DIFF__UNDER_STRING \
+  "___________________________________________________________________"
+
+/* The string used to mark a line in a hunk that doesn't end with a newline,
+ * when diffing a file.  Intentionally not marked for translation, for wider
+ * interoperability with patch(1) programs. */
+#define SVN_DIFF__NO_NEWLINE_AT_END_OF_FILE \
+          "\\ No newline at end of file"
+
+/* The string used to mark a line in a hunk that doesn't end with a newline,
+ * when diffing a Subversion property. */
+#define SVN_DIFF__NO_NEWLINE_AT_END_OF_PROPERTY \
+          "\\ No newline at end of property"
+
+/* Write a unidiff "---" and "+++" header to OUTPUT_STREAM.
+ *
+ * Write "---" followed by a space and OLD_HEADER and a newline,
+ * then "+++" followed by a space and NEW_HEADER and a newline.
+ *
+ * The text will be encoded into HEADER_ENCODING.
+ */
+svn_error_t *
+svn_diff__unidiff_write_header(svn_stream_t *output_stream,
+                               const char *header_encoding,
+                               const char *old_header,
+                               const char *new_header,
+                               apr_pool_t *scratch_pool);
+
+/* Display property changes in pseudo-Unidiff format.
+ *
+ * Write to @a outstream the changes described by @a propchanges based on
+ * original properties @a original_props.
+ *
+ * Write all mark-up text (headers and so on) using the character encoding
+ * @a encoding.
+ *
+ *   ### I think the idea is: we want the output to use @a encoding, and
+ *       we will assume the text of the user's files and the values of any
+ *       user-defined properties are already using @a encoding, so we don't
+ *       want to re-code the *whole* output.
+ *       So, shouldn't we also convert all prop names and all 'svn:*' prop
+ *       values to @a encoding, since we know those are stored in UTF-8?
+ *
+ * @a original_props is a hash mapping (const char *) property names to
+ * (svn_string_t *) values.  @a propchanges is an array of svn_prop_t
+ * representing the new values for any of the properties that changed, with
+ * a NULL value to represent deletion.
+ *
+ * If @a pretty_print_mergeinfo is true, then describe 'svn:mergeinfo'
+ * property changes in a human-readable form that says what changes were
+ * merged or reverse merged; otherwise (or if the mergeinfo property values
+ * don't parse correctly) display them just like any other property.
+ *
+ * Use @a scratch_pool for temporary allocations.
+ */
+svn_error_t *
+svn_diff__display_prop_diffs(svn_stream_t *outstream,
+                             const char *encoding,
+                             const apr_array_header_t *propchanges,
+                             apr_hash_t *original_props,
+                             svn_boolean_t pretty_print_mergeinfo,
+                             apr_pool_t *scratch_pool);
+
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* SVN_DIFF_PRIVATE_H */