[Rtir] Can't locate object method "header_out"

[Tony Arnold]

I've installed RT 3.7.26 and RTIR 2.3.17 on a Debian 4.0 system with
Apache2 server.

The RT bit seems to work OK, but I go to RTIR, I get "Can't locate
object method "header_out" via package "Apache2::RequestRec" at
/opt/rt3/share/html/dhandler line 53."

I presume this is some package missing or version mis-match, but I
cannot tell which!

Any ideas?

Regards,
Tony.
-- 
Tony Arnold,                        Tel: +44 (0) 161 275 6093
Head of IT Security,                Fax: +44 (0) 870 136 1004
University of Manchester,           Mob: +44 (0) 773 330 0039
Manchester M13 9PL.                 Email: tony.arnold at manchester.ac.uk