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-rw-r--r--libs/multiprecision/config/has_mpfr.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/libs/multiprecision/config/has_mpfr.cpp b/libs/multiprecision/config/has_mpfr.cpp
index 86101a3804..add5853ca3 100644
--- a/libs/multiprecision/config/has_mpfr.cpp
+++ b/libs/multiprecision/config/has_mpfr.cpp
@@ -3,6 +3,7 @@
// Boost Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#include <cstddef> // See https://gcc.gnu.org/gcc-4.9/porting_to.html
#include <mpfr.h>
#include <boost/config.hpp>