2012-05-09 19:44:43: (mod_fastcgi.c.1000) the fastcgi-backend /usr/bin/sw-engine-cgi -c /usr/local/psa/admin/conf/php.ini -d auto_prepend_file=auth.php3 -u psaadm failed to start:
2012-05-09 19:44:43: (mod_fastcgi.c.1004) child exited with status 1 /usr/bin/sw-engine-cgi -c /usr/local/psa/admin/conf/php.ini -d auto_prepend_file=auth.php3 -u psaadm
2012-05-09 19:44:43: (mod_fastcgi.c.1007) if you try do run PHP as FastCGI backend make sure you use the FastCGI enabled version.
You can find out if it is the right one by executing 'php -v' and it should display '(cgi-fcgi)' in the output, NOT (cgi) NOR (cli)
For more information check
http://www.lighttpd.net/documentation/fastcgi.html#preparing-php-as-a-fastcgi-program
2012-05-09 19:44:43: (mod_fastcgi.c.1012) If this is PHP on Gentoo add fastcgi to the USE flags
2012-05-09 19:44:43: (mod_fastcgi.c.1105) [ERROR]: spawning fcgi failed.