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diff --git a/lib/mlibc/options/ansi/generic/complex/cacosh.c b/lib/mlibc/options/ansi/generic/complex/cacosh.c
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--- a/lib/mlibc/options/ansi/generic/complex/cacosh.c
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-/* $NetBSD: cacosh.c,v 1.2 2009/08/03 19:41:32 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
- <<cacosh>>, <<cacoshf>>---complex arc hyperbolic cosine
-
-INDEX
- cacosh
-INDEX
- cacoshf
-
-ANSI_SYNOPSIS
- #include <complex.h>
- double complex cacosh(double complex <[z]>);
- float complex cacoshf(float complex <[z]>);
-
-
-DESCRIPTION
- These functions compute the complex arc hyperbolic cosine of <[z]>,
- with a branch cut at values less than 1 along the real axis.
-
- <<cacoshf>> is identical to <<cacosh>>, except that it performs
- its calculations on <<floats complex>>.
-
-RETURNS
- @ifnottex
- These functions return the complex arc hyperbolic cosine value,
- in the range of a half-strip of non-negative values along the
- real axis and in the interval [-i * pi, +i * pi] along the
- imaginary axis.
- @end ifnottex
- @tex
- These functions return the complex arc hyperbolic cosine value,
- in the range of a half-strip of non-negative values along the
- real axis and in the interval [$-i\pi$, $+i\pi$] along the
- imaginary axis.
- @end tex
-
-PORTABILITY
- <<cacosh>> and <<cacoshf>> are ISO C99
-
-QUICKREF
- <<cacosh>> and <<cacoshf>> are ISO C99
-
-*/
-
-
-#include <complex.h>
-
-double complex
-cacosh(double complex z)
-{
- double complex w;
-
-#if 0 /* does not give the principal value */
- w = I * cacos(z);
-#else
- w = clog(z + csqrt(z + 1) * csqrt(z - 1));
-#endif
- return w;
-}