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diff -up boost/boost/math/special_functions/fpclassify.hpp.dt boost/boost/math/special_functions/fpclassify.hpp
--- boost/boost/math/special_functions/fpclassify.hpp.dt 2017-02-03 07:59:18.805415876 +0100
+++ boost/boost/math/special_functions/fpclassify.hpp 2017-02-03 08:00:45.046494362 +0100
@@ -134,7 +134,7 @@ inline bool is_nan_helper(T, const boost
inline bool is_nan_helper(__float128 f, const std::true_type&) { return ::isnanq(f); }
inline bool is_nan_helper(__float128 f, const std::false_type&) { return ::isnanq(f); }
#elif defined(BOOST_GNU_STDLIB) && BOOST_GNU_STDLIB && \
- _GLIBCXX_USE_C99_MATH && !_GLIBCXX_USE_C99_FP_MACROS_DYNAMIC
+ _GLIBCXX_USE_C99_MATH && (!defined(_GLIBCXX_USE_C99_FP_MACROS_DYNAMIC) || !_GLIBCXX_USE_C99_FP_MACROS_DYNAMIC)
inline bool is_nan_helper(__float128 f, const std::true_type&) { return std::isnan(static_cast<double>(f)); }
inline bool is_nan_helper(__float128 f, const std::false_type&) { return std::isnan(static_cast<double>(f)); }
#else
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