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 */
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 */
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#ifndef R_ARITH_H_
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#ifndef R_ARITH_H_
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#define R_ARITH_H_
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#define R_ARITH_H_
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#if defined(HAVE_GLIBC2) && !defined(_BSD_SOURCE)
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/* ensure that finite and isnan are declared */
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# define _BSD_SOURCE 1
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#endif
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#include <math.h>
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#include <math.h>
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#include <R_ext/libextern.h>
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#include <R_ext/libextern.h>
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#ifdef  __cplusplus
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#ifdef  __cplusplus
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extern "C" {
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extern "C" {