You wrote :

> This is what happens:
[...]

You're perfectly right. I actually didn't notice that my NetBSD box here
at home does have DESTDIR commented out in mk.conf. And in fact, I never
had such a problem here.

I filed a pr, asking at least for a warning in the "usage" text of
build.sh

Thanks,

-- 
Xavier
http://www.freetibet.org
http://www.tibet.fr/