Smarty installation problem

hello every body

I am trying to install Smarty-2.6.14 on my FC5 machine.
i am using PHP5 and apache2 and use my home dir for web hosting

I am geting following error: -
*Fatal error*: Smarty error: unable to write to $compile_dir
'/home/rakesh/public_html/Smarty/templates_c'. Be sure $compile_dir is
writable by the web server user. in *
/usr/local/lib/php/Smarty/Smarty.class.php* on line *1095

can any body hellp me out

with regard
rakesh
*