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