If I'm feeling extra lazy I usually just 'require' some other file into the program. eg:

package MY::Conf;
#No directories or URLs end in "/"
our %var;

#################################

$var{DATA_DIR} = "Zephir/data";
$var{CONF_DIR} = "Zephir/conf";
$var{AVATAR_DIR} = "images/buttons";
$var{AVATAR_URL} = "/images/buttons";
$var{TMPL_DIR} = "Zephir/tmpl";
$var{HOME_PAGE} = "http://asdf.net/";
$var{HOSTNAME} = "asdf.net";
1;
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-caedes