/usr/include/FL/math.h is in libfltk1.1-dev 1.1.10-19+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// "$Id: math.h 4288 2005-04-16 00:13:17Z mike $"
//
// Math header file for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2005 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems on the following page:
//
// http://www.fltk.org/str.php
//
#ifndef fl_math_h
# define fl_math_h
// Apple's ProjectBuilder has the nasty habit of including recursively
// down the file tree. To avoid re-including <FL/math.h> we must
// directly include the systems math file. (Plus, I could not find a
// predefined macro for ProjectBuilder builds, so we have to define it
// in the project)
# if defined(__APPLE__) && defined(__PROJECTBUILDER__)
# include "/usr/include/math.h"
# else
# include <math.h>
# endif
# ifdef __EMX__
# include <float.h>
# endif
# ifndef M_PI
# define M_PI 3.14159265358979323846
# define M_PI_2 1.57079632679489661923
# define M_PI_4 0.78539816339744830962
# define M_1_PI 0.31830988618379067154
# define M_2_PI 0.63661977236758134308
# endif // !M_PI
# ifndef M_SQRT2
# define M_SQRT2 1.41421356237309504880
# define M_SQRT1_2 0.70710678118654752440
# endif // !M_SQRT2
# if (defined(WIN32) || defined(CRAY)) && !defined(__MINGW32__) && !defined(__MWERKS__)
inline double rint(double v) {return floor(v+.5);}
inline double copysign(double a, double b) {return b<0 ? -a : a;}
# endif // (WIN32 || CRAY) && !__MINGW32__ && !__MWERKS__
#endif // !fl_math_h
//
// End of "$Id: math.h 4288 2005-04-16 00:13:17Z mike $".
//
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