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--- ceph-15.1.0/src/common/bit_str.h.orig	2020-02-03 09:47:20.047149798 -0500
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+++ ceph-15.1.0/src/common/bit_str.h	2020-02-03 09:47:50.213149798 -0500
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@@ -17,6 +17,7 @@
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 #include <cstdint>
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 #include <iosfwd>
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 #include <functional>
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+#include <ostream>
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 namespace ceph {
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   class Formatter;