diff --git a/rtengine/colorclip.h b/rtengine/colorclip.h
deleted file mode 100644
index 6a3144166..000000000
--- a/rtengine/colorclip.h
+++ /dev/null
@@ -1,169 +0,0 @@
-/*
- *  This file is part of RawTherapee.
- *
- *  Copyright (c) 2004-2010 Gabor Horvath <hgabor@rawtherapee.com>
- *
- *  RawTherapee 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, either version 3 of the License, or
- *  (at your option) any later version.
- *
- *  RawTherapee 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 RawTherapee.  If not, see <http://www.gnu.org/licenses/>.
- */
-inline double tightestroot (double L, double a, double b, double r1, double r2, double r3);
-
-#ifndef __COLORCLIP__
-#define __COLORCLIP__
-
-#include <cmath>
-#include "median.h"
-
-// gives back the tightest >0 amplification by which color clipping occures
-
-inline double tightestroot (double L, double a, double b, double r1, double r2, double r3)
-{
-
-    double an = a / 500.0, bn = b / 200.0, p = (L + 16.0) / 116.0;
-
-    double coeff3 = r1 * an * an * an - r3 * bn * bn * bn;
-    double coeff2 = 3.0 * p * (r1 * an * an + r3 * bn * bn);
-    double coeff1 = 3.0 * p * p * (r1 * an - r3 * bn);
-    double coeff0 = p * p * p * (r1 + r2 + r3) - 1.0;
-
-    double a1 = coeff2 / coeff3;
-    double a2 = coeff1 / coeff3;
-    double a3 = coeff0 / coeff3;
-
-    double Q = (a1 * a1 - 3.0 * a2) / 9.0;
-    double R = (2.0 * a1 * a1 * a1 - 9.0 * a1 * a2 + 27.0 * a3) / 54.0;
-    double Qcubed = Q * Q * Q;
-    double d = Qcubed - R * R;
-
-//  printf ("input L=%g, a=%g, b=%g\n", L, a, b);
-//  printf ("c1=%g, c2=%g, c3=%g, c4=%g\n", coeff3, coeff2, coeff1, coeff0);
-
-
-    /* Three real roots */
-    if (d >= 0) {
-        double theta = acos(R / sqrt(Qcubed));
-        double sqrtQ = sqrt(Q);
-        double x0 = -2.0 * sqrtQ * cos( theta               / 3.0) - a1 / 3.0;
-        double x1 = -2.0 * sqrtQ * cos((theta + 2.0 * M_PI) / 3.0) - a1 / 3.0;
-        double x2 = -2.0 * sqrtQ * cos((theta + 4.0 * M_PI) / 3.0) - a1 / 3.0;
-
-//    printf ("3 roots: %g, %g, %g\n", x0, x1, x2);
-
-        SORT3 (x0, x1, x2, a1, a2, a3);
-
-        if (a1 > 0) {
-            return a1;
-        }
-
-        if (a2 > 0) {
-            return a2;
-        }
-
-        if (a3 > 0) {
-            return a3;
-        }
-
-        return -1;
-    }
-
-    /* One real root */
-    else {
-//    double e = pow(sqrt(-d) + fabs(R), 1.0 / 3.0);
-        double e = exp (1.0 / 3.0 * log (sqrt(-d) + fabs(R)));
-
-        if (R > 0) {
-            e = -e;
-        }
-
-        double x0 = (e + Q / e) - a1 / 3.0;
-
-//    printf ("1 root: %g\n", x0);
-
-        if (x0 < 0) {
-            return -1;
-        } else {
-            return x0;
-        }
-    }
-}
-
-
-/*******************************************************************************
- * FindCubicRoots
- * --------------
- *
- * Copyright (C) 1997-2001 Ken Turkowski. <turk_at_computer.org>
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, sublicense, and/or sell copies of the Software, and to
- * permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
- * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
- * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
- * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
- * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- *
- * ------------------------------------------------------------------------
- *
- *  Solve:
- *      coeff[3] * x^3 + coeff[2] * x^2 + coeff[1] * x + coeff[0] = 0
- *
- *  returns:
- *      3 - 3 real roots
- *      1 - 1 real root (2 complex conjugate)
- *
- *******************************************************************************/
-
-/*long
-FindCubicRoots(const FLOAT coeff[4], FLOAT x[3])
-{
-    FLOAT a1 = coeff[2] / coeff[3];
-    FLOAT a2 = coeff[1] / coeff[3];
-    FLOAT a3 = coeff[0] / coeff[3];
-
-    double_t Q = (a1 * a1 - 3 * a2) / 9;
-    double_t R = (2 * a1 * a1 * a1 - 9 * a1 * a2 + 27 * a3) / 54;
-    double_t Qcubed = Q * Q * Q;
-    double_t d = Qcubed - R * R;
-
-    // Three real roots
-    if (d >= 0) {
-        double_t theta = acos(R / sqrt(Qcubed));
-        double_t sqrtQ = sqrt(Q);
-        x[0] = -2 * sqrtQ * cos( theta           / 3) - a1 / 3;
-        x[1] = -2 * sqrtQ * cos((theta + 2 * pi) / 3) - a1 / 3;
-        x[2] = -2 * sqrtQ * cos((theta + 4 * pi) / 3) - a1 / 3;
-        return (3);
-    }
-
-    // One real root
-    else {
-        double_t e = pow(sqrt(-d) + fabs(R), 1. / 3.);
-        if (R > 0)
-            e = -e;
-        x[0] = (e + Q / e) - a1 / 3.;
-        return (1);
-    }
-}
-*/
-#endif