'pear upgrade' not working

["Oliver Schulze L." <oliver@xxxxxxxxxxxxx>]

Hi,
I tried to update my PHP PEAR installation with:
# pear upgrade
and it failled with this error:
<br />
<b>Warning</b>:  call_user_func() expects first argument, 
'PEAR_Command_Build::getCommands', to be a valid callback in 
<b>/usr/share/pear/PEAR/Command.php</b> on line <b>180</b><br />
<br />
<b>Warning</b>:  Invalid argument supplied for foreach() in 
<b>/usr/share/pear/PEAR/Command.php</b> on line <b>181</b><br />
could not open the package file:

Is this broken? I have:
php-4.2.2-17.2

Thanks
Oliver

--
Oliver Schulze L.
<oliver@xxxxxxxxxxxxx>