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-rw-r--r--boost/type_traits/conditional.hpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/boost/type_traits/conditional.hpp b/boost/type_traits/conditional.hpp
index 5890198ba2..ec31d8b0bb 100644
--- a/boost/type_traits/conditional.hpp
+++ b/boost/type_traits/conditional.hpp
@@ -9,6 +9,8 @@
#ifndef BOOST_TT_CONDITIONAL_HPP_INCLUDED
#define BOOST_TT_CONDITIONAL_HPP_INCLUDED
+#include <boost/config.hpp>
+
namespace boost {
template <bool b, class T, class U> struct conditional { typedef T type; };