In libbson 1.2.0beta
libbson-devel.x86_64: W: manual-page-warning /usr/share/man/man3/bson_zero_free.3.gz 42: warning: macro `d' not defined
libbson-devel.x86_64: W: manual-page-warning /usr/share/man/man3/bson_json_reader_new_from_fd.3.gz 35: warning: macro `d' not defined
libbson-devel.x86_64: W: manual-page-warning /usr/share/man/man3/bson_oid_t.3.gz 56: warning: macro `s' not defined
libbson-devel.x86_64: W: manual-page-warning /usr/share/man/man3/bson_reader_new_from_fd.3.gz 35: warning: macro `d' not defined
I think ".B .B" is not correct (and thus ".B mem" is displayed)