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diff --git a/tesseract/src/classify/normfeat.h b/tesseract/src/classify/normfeat.h
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+/******************************************************************************
+ ** Filename:    normfeat.h
+ ** Purpose:     Definition of character normalization features.
+ ** Author:      Dan Johnson
+ ** History:     12/14/90, DSJ, Created.
+ **
+ ** (c) Copyright Hewlett-Packard Company, 1988.
+ ** Licensed 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.
+ *****************************************************************************/
+
+#ifndef NORMFEAT_H
+#define NORMFEAT_H
+
+#include "ocrfeatures.h"
+
+namespace tesseract {
+
+#define LENGTH_COMPRESSION  (10.0)
+
+struct INT_FX_RESULT_STRUCT;
+
+typedef enum {
+    CharNormY, CharNormLength, CharNormRx, CharNormRy
+} NORM_PARAM_NAME;
+
+float ActualOutlineLength(FEATURE Feature);
+
+FEATURE_SET ExtractCharNormFeatures(const INT_FX_RESULT_STRUCT &fx_info);
+
+}
+
+#endif