NF
flg |= NF;
#define BDARCH (CF|KF|LF|NF|PF|RF|CDF|CEF|CYF|CZF)
char *fields[NF];
nf = split(string, fields, NF, seps);
print(nf, NF, fields);
const char *NF; /* name of ditroff filter (per job) */
extern const char *NF; /* name of ditroff(1) filter (per job) */
NF = cgetstr(bp, "nf", &s) == -1 ? NULL : s;
prog = (format == 't') ? TF : (format == 'n') ? NF : DF;