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diff --git a/tesseract/src/ccstruct/quadlsq.h b/tesseract/src/ccstruct/quadlsq.h
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+/**********************************************************************
+ * File:        quadlsq.h  (Formerly qlsq.h)
+ * Description: Code for least squares approximation of quadratics.
+ * Author:      Ray Smith
+ * Created:     Wed Oct  6 15:14:23 BST 1993
+ *
+ * (C) Copyright 1993, Hewlett-Packard Ltd.
+ ** 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 QUADLSQ_H
+#define QUADLSQ_H
+
+#include "points.h"
+
+namespace tesseract {
+
+class QLSQ
+{
+  public:
+    QLSQ() {  //constructor
+      clear();  //set to zeros
+    }
+    void clear();  //initialize
+
+    void add(           //add element
+             double x,  //coords to add
+             double y);
+    void remove(           //delete element
+                double x,  //coords to delete
+                double y);
+    int32_t count() {  //no of elements
+      return n;
+    }
+
+    void fit(              //fit the given
+             int degree);  //return actual
+    double get_a() {  //get x squard
+      return a;
+    }
+    double get_b() {  //get x squard
+      return b;
+    }
+    double get_c() {  //get x squard
+      return c;
+    }
+
+  private:
+    int32_t n;                     //no of elements
+    double a, b, c;              //result
+    double sigx;                 //sum of x
+    double sigy;                 //sum of y
+    double sigxx;                //sum x squared
+    double sigxy;                //sum of xy
+    double sigyy;                //sum y squared
+    long double sigxxx;          //sum x cubed
+    long double sigxxy;          //sum xsquared y
+    long double sigxxxx;         //sum x fourth
+};
+
+} // namespace tesseract
+
+#endif