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-rw-r--r--boost/type_traits/is_complex.hpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/boost/type_traits/is_complex.hpp b/boost/type_traits/is_complex.hpp
index 7cf04b4796..c4554cea08 100644
--- a/boost/type_traits/is_complex.hpp
+++ b/boost/type_traits/is_complex.hpp
@@ -8,6 +8,7 @@
#ifndef BOOST_TT_IS_COMPLEX_HPP
#define BOOST_TT_IS_COMPLEX_HPP
+#include <boost/config.hpp>
#include <complex>
#include <boost/type_traits/integral_constant.hpp>