clrbitn
clrbitn(D_ETRNONLY, Daemons[idx].d_flags);
clrbitn(M_LMTP, m->m_flags);
clrbitn(id, mac->mac_allocated);
clrbitn(M_MUSER, ProgMailer->m_flags);
clrbitn(M_MUSER, FileMailer->m_flags);
clrbitn('\t', badchars);
clrbitn(DBS_GROUPWRITABLEDIRPATHSAFE,
clrbitn(fd, baseline);