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diff --git a/tesseract/src/classify/featdefs.h b/tesseract/src/classify/featdefs.h
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+/******************************************************************************
+ ** Filename:    featdefs.h
+ ** Purpose:     Definitions of currently defined feature types.
+ ** Author:      Dan Johnson
+ **
+ ** (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 FEATDEFS_H
+#define FEATDEFS_H
+
+#include "ocrfeatures.h"
+
+namespace tesseract {
+
+/* Enumerate the different types of features currently defined. */
+#define NUM_FEATURE_TYPES 4
+extern TESS_API const char* const kMicroFeatureType;
+extern TESS_API const char* const kCNFeatureType;
+extern TESS_API const char* const kIntFeatureType;
+extern TESS_API const char* const kGeoFeatureType;
+
+/* A character is described by multiple sets of extracted features.  Each
+  set contains a number of features of a particular type, for example, a
+  set of bays, or a set of closures, or a set of microfeatures.  Each
+  feature consists of a number of parameters.  All features within a
+  feature set contain the same number of parameters.*/
+
+struct CHAR_DESC_STRUCT {
+  uint32_t NumFeatureSets;
+  FEATURE_SET FeatureSets[NUM_FEATURE_TYPES];
+};
+using CHAR_DESC = CHAR_DESC_STRUCT *;
+
+struct FEATURE_DEFS_STRUCT {
+  int32_t NumFeatureTypes;
+  const FEATURE_DESC_STRUCT* FeatureDesc[NUM_FEATURE_TYPES];
+};
+using FEATURE_DEFS = FEATURE_DEFS_STRUCT *;
+
+/*----------------------------------------------------------------------
+    Generic functions for manipulating character descriptions
+----------------------------------------------------------------------*/
+TESS_API
+void InitFeatureDefs(FEATURE_DEFS_STRUCT *featuredefs);
+
+TESS_API
+void FreeCharDescription(CHAR_DESC CharDesc);
+
+CHAR_DESC NewCharDescription(const FEATURE_DEFS_STRUCT &FeatureDefs);
+
+bool ValidCharDescription(const FEATURE_DEFS_STRUCT &FeatureDefs,
+                          CHAR_DESC CharDesc);
+
+void WriteCharDescription(const FEATURE_DEFS_STRUCT& FeatureDefs,
+                          CHAR_DESC CharDesc, STRING* str);
+
+TESS_API
+CHAR_DESC ReadCharDescription(const FEATURE_DEFS_STRUCT &FeatureDefs,
+                              FILE *File);
+
+TESS_API
+uint32_t ShortNameToFeatureType(const FEATURE_DEFS_STRUCT &FeatureDefs,
+                                const char *ShortName);
+
+/**----------------------------------------------------------------------------
+        Global Data Definitions and Declarations
+----------------------------------------------------------------------------**/
+extern const FEATURE_DESC_STRUCT MicroFeatureDesc;
+extern TESS_API const FEATURE_DESC_STRUCT PicoFeatDesc;
+extern const FEATURE_DESC_STRUCT CharNormDesc;
+extern const FEATURE_DESC_STRUCT OutlineFeatDesc;
+extern const FEATURE_DESC_STRUCT IntFeatDesc;
+extern const FEATURE_DESC_STRUCT GeoFeatDesc;
+
+} // namespace tesseract
+
+#endif