go-pear question

Hello, I'm trying to install pear on a shared host with go-pear. I've created a world writable directory outside the document root. The go-pear script is in a subdirectory of the documet root. The php binary is in /usr/local/bin/php So: The go-pear script is in: /opt/guide/www.domain.com/HTML/pear/go-pear.php , $prefix = /opt/guide/www.domain.com/pear , for filename of webfrontend I have: /opt/guide/www.domain.com/HTML/pear/index.php and for php.exe path I have /usr/local/bin/php When I run go-pear I first get the warning: Warning: set_time_limit(): Cannot set time limit in safe mode in /opt/guide/www.domain.com/HTML/pear/go-pear.php on line 79 Starting installation ... and then the error: Error System's Tempdir failed, trying to use $prefix/tmp ...mkdir failed: / mkdir /tmp ... failed What is going wrong here? I checked, the $prefix directory is world writable. I don't understand it.. I hope somebody can help me with this.. Thanks, Steven