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It's not affected on Debian/Ubuntu, check --with-debug flag.

Thank you.

btw, I use packages from nginx.org, they're updated in time with every release: http://nginx.org/en/linux_packages.html

Do the upstream packages still use a different configuration path from the Debian/Ubuntu packages?

Yes. There's no sites-available or sites-enabled, and some configuration is split off into different files in the conf.d directory.