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--- a/include/boost/iostreams/detail/system_failure.hpp (index)
+++ b/include/boost/iostreams/detail/system_failure.hpp (working tree)
@@ -27,1 +27,3 @@ namespace std { using ::strlen; }
-# define WIN32_LEAN_AND_MEAN // Exclude rarely-used stuff from Windows headers
+# ifndef WIN32_LEAN_AND_MEAN
+# define WIN32_LEAN_AND_MEAN // Exclude rarely-used stuff from Windows headers
+# endif
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