[imp] compose errors IMP 2.3.6

[Peter R. Hubberstey]

>> Warning: Failed opening 'Mail/rfc822.php' for inclusion
>> (include_path='/usr/local/lib/php') in /data1/web/horde/lib/MIME.php on
line
>> 73
>
>Probably you haven't installed PEAR properly.  What exact version of PHP
>are you using?  Did you try the horde/test.php page (which will identify
>problems like the above)?

You're a star Brent - thanks for the suggestion ;-)

I've checked but everything looks OK...
PHP 4.0.5

PEAR is in the php library path.
the test comes up with this.

Horde Versions
Horde: 1.3.3
IMP: 2.3.6
Turba: 0.0.2-cvs
PHP Version
PHP Version: 4.0.5
PHP Major Version: 4
PHP Minor Version: 5
PHP Version Classification: release
You are running a supported release of PHP4. Enjoy the ride!
PHP Module Capabilities
FTP Support: Yes
Gettext Support: Yes
IMAP Support: Yes
LDAP Support: No
MCAL Support: No
Mcrypt Support: Yes
MySQL Support: Yes
PostgreSQL Support: No
XML Support: Yes
Miscellaneous PHP Settings
magic_quotes_gpc set to Off: Yes
magic_quotes_runtime set to Off: Yes