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diff --git a/src/bldprogs/scmdiff.h b/src/bldprogs/scmdiff.h
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+++ b/src/bldprogs/scmdiff.h
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+/* $Id: scmdiff.h $ */
+/** @file
+ * IPRT Testcase / Tool - Source Code Massager Diff Code.
+ */
+
+/*
+ * Copyright (C) 2010-2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#ifndef VBOX_INCLUDED_SRC_bldprogs_scmdiff_h
+#define VBOX_INCLUDED_SRC_bldprogs_scmdiff_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <iprt/stream.h>
+#include "scmstream.h"
+
+RT_C_DECLS_BEGIN
+
+/**
+ * Diff state.
+ */
+typedef struct SCMDIFFSTATE
+{
+    size_t          cDiffs;
+    const char     *pszFilename;
+
+    PSCMSTREAM      pLeft;
+    PSCMSTREAM      pRight;
+
+    /** Whether to ignore end of line markers when diffing. */
+    bool            fIgnoreEol;
+    /** Whether to ignore trailing whitespace. */
+    bool            fIgnoreTrailingWhite;
+    /** Whether to ignore leading whitespace. */
+    bool            fIgnoreLeadingWhite;
+    /** Whether to print special characters in human readable form or not. */
+    bool            fSpecialChars;
+    /** The tab size. */
+    size_t          cchTab;
+    /** Where to push the diff. */
+    PRTSTREAM       pDiff;
+} SCMDIFFSTATE;
+/** Pointer to a diff state. */
+typedef SCMDIFFSTATE *PSCMDIFFSTATE;
+
+
+size_t ScmDiffStreams(const char *pszFilename, PSCMSTREAM pLeft, PSCMSTREAM pRight, bool fIgnoreEol,
+                      bool fIgnoreLeadingWhite, bool fIgnoreTrailingWhite, bool fSpecialChars,
+                      size_t cchTab, PRTSTREAM pDiff);
+
+RT_C_DECLS_END
+
+#endif /* !VBOX_INCLUDED_SRC_bldprogs_scmdiff_h */
+