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-rw-r--r--contrib/src/boost/type_traits/is_abstract.hpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/contrib/src/boost/type_traits/is_abstract.hpp b/contrib/src/boost/type_traits/is_abstract.hpp
index 7715c5c..781d94a 100644
--- a/contrib/src/boost/type_traits/is_abstract.hpp
+++ b/contrib/src/boost/type_traits/is_abstract.hpp
@@ -48,6 +48,7 @@
// to degrade gracefully, rather than trash the compiler (John Maddock).
//
+#include <cstddef> // size_t
#include <boost/type_traits/intrinsics.hpp>
#include <boost/type_traits/integral_constant.hpp>
#ifndef BOOST_IS_ABSTRACT