Why relative links are bad for the ps themes compiled directory
From PsychoWiki
This page will explain why you can not use a relative directory for the ps_themes_compiled directory when installing.
When you are installing you are in this file structurer
root->web_dir->install_dir
Ok when you let the installer use ./ps_themes_compiled/ that means
root->web_dir->ps_themes_compiled
But when you done with the install and the main page goes to look for the ps_themes_compiled directory it will look here
root->ps_themes_compiled
So if you use /tmp/ps_themes_compiled it will always look for it here
root->tmp->ps_themes_compiled