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/usr/include/ivstd/math.h is in ivtools-dev 1.2.11a1-11.

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The actual contents of the file can be viewed below.

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#ifndef ivtools_math_h
#define ivtools_math_h

#if defined(__cplusplus)
#include_next <math.h>
#else
#if defined(__APPLE__)
#define __DARWIN_UNIX03 1
#endif
#include </usr/include/math.h>
#endif

#if defined(sun) && defined(__svr4__)
#include <nan.h>
#define isinf(n) IsINF(n)
#endif

#endif