_PWF_GID
if (src->pw_fields & _PWF_GID)
COPY(pw_gid, _PWF_GID);
pw->pw_fields |= _PWF_GID;
fields &= ~_PWF_GID;
#define PW_GID _PWF_GID
pwd.pw_fields & _PWF_GID ? gidstr : "",
yp_password.pw_fields |= _PWF_GID;