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PHP _SERVER["USER"] and _SERVER["HOME"]

I run PHP via FastCGI with nginx web server on Gentoo. PHP is started by spawn-fcgi script from lighttpd, which is started run as a daemon using start-stop-daemon. Among other things, startup scripts cleans-up environment, so that only PATH, PHP_FCGI_CHILDREN and PHP_FCGI_MAX_REQUESTS are left when PHP is started. However on my machine, additionally to those variables I also see USER and HOME variables. Not only they are there, but they are also set to "root" and "/root" respectively, which is wrong as PHP is run as user "nobody" (confirmed using echo exec('whoami');). What is wrong with my install? How can I get rid of these variables that should not be there?

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