>Well, what I want to know is: how did it figure out I'm running on an
>i386, and not a sparc?

I think its the

    uname(&u);
    if (s_strlcat(sitepath, u.machine, sizeof(sitepath)))
        return NULL;

I cannot speak to the supply of sparcs acutally running FreeBSD, tho :->

NetBSD might need more careful handling of MACHINE_ARCH vs MACHINE,
and smarter 64/32 handling (or more symlinks), but you get the idea.