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diff --git a/lib/mlibc/options/ansi/generic/complex/ctanh.c b/lib/mlibc/options/ansi/generic/complex/ctanh.c
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--- a/lib/mlibc/options/ansi/generic/complex/ctanh.c
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-/* $NetBSD: ctanh.c,v 1.1 2007/08/20 16:01:38 drochner Exp $ */
-
-/*-
- * Copyright (c) 2007 The NetBSD Foundation, Inc.
- * All rights reserved.
- *
- * This code is derived from software written by Stephen L. Moshier.
- * It is redistributed by the NetBSD Foundation by permission of the author.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
- * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
- * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
- * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- * imported and modified include for newlib 2010/10/03
- * Marco Atzeri <marco_atzeri@yahoo.it>
- */
-
-/*
-FUNCTION
- <<ctanh>>, <<ctanf>>---complex hyperbolic tangent
-
-INDEX
- ctanh
-INDEX
- ctanhf
-
-ANSI_SYNOPSIS
- #include <complex.h>
- double complex ctanh(double complex <[z]>);
- float complex ctanhf(float complex <[z]>);
-
-
-DESCRIPTION
- These functions compute the complex hyperbolic tangent of <[z]>.
-
- <<ctanhf>> is identical to <<ctanh>>, except that it performs
- its calculations on <<floats complex>>.
-
-RETURNS
- These functions return the complex hyperbolic tangent value.
-
-PORTABILITY
- <<ctanh>> and <<ctanhf>> are ISO C99
-
-QUICKREF
- <<ctanh>> and <<ctanhf>> are ISO C99
-
-*/
-
-
-#include <complex.h>
-#include <math.h>
-
-double complex
-ctanh(double complex z)
-{
- double complex w;
- double x, y, d;
-
- x = creal(z);
- y = cimag(z);
- d = cosh(2.0 * x) + cos(2.0 * y);
- w = sinh(2.0 * x) / d + (sin(2.0 * y) / d) * I;
-
- return w;
-}