time_to_string
time_to_string(&gn->mtime));
time_to_string(&mtime), file);
printf("Caching %s for %s\n", time_to_string(&mtime),
time_to_string(&entry->mtime), fullName);
time_to_string(&gn->mtime),
time_to_string(&gn->mtime));
time_to_string(&cgn->mtime));
extern char *time_to_string(struct timespec *);