[xdebug-general] XDebug module not loading.

I'm just tried installing XDebug, and it's silently failing to load. Below is
the output of various tests. Any ideas?

mini ext # echo "<?php phpinfo() ?>" | php | grep xdebug
/etc/php/cli-php5/ext/xdebug.ini
mini ext # cat /etc/php/cli-php5/ext/xdebug.ini
zend_extension=/usr/lib/php5/lib/php/extensions/debug-non-zts-20041030/xdebug.so
mini ext # ls
-la /usr/lib/php5/lib/php/extensions/debug-non-zts-20041030/xdebug.so
-rw-r--r-- 1 root root 151436 Oct 7
11:18 /usr/lib/php5/lib/php/extensions/debug-non-zts-20041030/xdebug.so
mini ext # php -m
[PHP Modules]
ctype
curl
dba
dom
gd
gettext
ldap
libxml
mbstring
mcrypt
mysql
ncurses
openssl
pcre
PDO
pdo_mysql
pdo_sqlite
pspell
readline
session
SimpleXML
snmp
soap
SQLite
standard
tokenizer
xml
xsl
zlib

[Zend Modules]

Kind Regards,

-- 
Ian P. Christian ~ http://pookey.co.uk