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-rw-r--r--boost/ratio/include.hpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/boost/ratio/include.hpp b/boost/ratio/include.hpp
index 44b7b45c80..2fc13a4889 100644
--- a/boost/ratio/include.hpp
+++ b/boost/ratio/include.hpp
@@ -10,6 +10,7 @@
#include <boost/ratio/ratio.hpp>
#include <boost/ratio/ratio_io.hpp>
+#ifdef BOOST_RATIO_EXTENSIONS
#include <boost/ratio/mpl/rational_constant.hpp>
-
+#endif
#endif // BOOST_RATIO_INCLUDE_HPP