roff_setreg
void roff_setreg(struct roff *, const char *, int, char);
roff_setreg(man->roff, "an-margin", nn->head->aux, '-');
roff_setreg(man->roff, "an-margin",
roff_setreg(man->roff, "an-margin",
roff_setreg(mdoc->roff, "nS", 1, '=');
roff_setreg(mdoc->roff, "nS", 0, '=');
roff_setreg(mdoc->roff, "nS", 1, '=');
roff_setreg(mdoc->roff, "nS", 0, '=');
roff_setreg(man->roff, "nS", 0, '=');