tgetstr ("md", NULL) crashes on NetBSD. It's here:

src/lib/libterm/termcap.c:

char *
t_getstr(struct tinfo *info, const char *id, char **area, size_t *limit)
{
...
                _DIAGASSERT(limit != NULL);
                *limit = i;			<=====
                free(s);
                return NULL;
...
}

Other systems support tgetstr ("md", NULL) without problems, and
return the string in a statically allocated buffer.

Bruno