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diff --git a/winsup/cygwin/math/clog10.def.h b/winsup/cygwin/math/clog10.def.h
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+++ b/winsup/cygwin/math/clog10.def.h
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+/*
+ This Software is provided under the Zope Public License (ZPL) Version 2.1.
+
+ Copyright (c) 2009, 2010 by the mingw-w64 project
+
+ See the AUTHORS file for the list of contributors to the mingw-w64 project.
+
+ This license has been certified as open source. It has also been designated
+ as GPL compatible by the Free Software Foundation (FSF).
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+
+   1. Redistributions in source code must retain the accompanying copyright
+      notice, this list of conditions, and the following disclaimer.
+   2. Redistributions in binary form must reproduce the accompanying
+      copyright notice, this list of conditions, and the following disclaimer
+      in the documentation and/or other materials provided with the
+      distribution.
+   3. Names of the copyright holders must not be used to endorse or promote
+      products derived from this software without prior written permission
+      from the copyright holders.
+   4. The right to distribute this software or to use it for any purpose does
+      not give you the right to use Servicemarks (sm) or Trademarks (tm) of
+      the copyright holders.  Use of them is covered by separate agreement
+      with the copyright holders.
+   5. If any files are modified, you must cause the modified files to carry
+      prominent notices stating that you changed the files and the date of
+      any change.
+
+ Disclaimer
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY EXPRESSED
+ 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 COPYRIGHT HOLDERS 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.
+*/
+
+__FLT_TYPE __complex__ __cdecl
+__FLT_ABI(clog10) (__FLT_TYPE __complex__ z)
+{
+  __complex__ __FLT_TYPE ret;
+  int r_class = fpclassify (__real__ z);
+  int i_class = fpclassify (__imag__ z);
+
+  if (r_class == FP_ZERO && i_class == FP_ZERO)
+  {
+    __imag__ ret = signbit (__real__ z) ? __FLT_PI : __FLT_CST(0.0);
+    __imag__ ret = __FLT_ABI(copysign) (__imag__ ret, __imag__ z);
+    __real__ ret = -__FLT_CST(1.0) / __FLT_ABI(fabs) (__real__ z);
+    return ret;
+  }
+
+  if (r_class == FP_NAN || i_class == FP_NAN)
+  {
+    __imag__ ret = __FLT_NAN;
+    __real__ ret = ((r_class == FP_INFINITE || i_class == FP_INFINITE) ? __FLT_HUGE_VAL : __FLT_NAN);
+
+    return ret;
+  }
+
+  __real__ ret = __FLT_ABI(log10) (__FLT_ABI(hypot) (__real__ z, __imag__ z));
+  __imag__ ret = __FLT_LOG10E * __FLT_ABI(atan2) (__imag__ z, __real__ z);
+  return ret;
+}