Installing Kolab2 on "Sarge"

[Stefan Lang]

Hello List,

On my debian "Sarge" server I downloaded all packages from 
ftp://ftp.kolab.org/kolab/server/development/current/sources/
and inside the DL-directory I did a
./obmtool kolab

Here comes the command output:
---- boot/build zeus %kolab ----
obmtool:NOTICE: did not find openpkg/rpm executable. Checking/fetching binary 
sh.
obmtool:NOTICE: did not find binary sh. Checking/fetching source sh.
OpenPKG 2.1-SOLID Source Bootstrap Package, version 2.1.2
Building for prefix /kolab on current platform
++ extracting OpenPKG source distribution
++ building OpenPKG binary distribution
OpenPKG Bootstrap Procedure
++ bootstrap version: 2.1.2-2.1.2
++ user/group pairs: root/root kolab/kolab kolab-r/kolab-r kolab-n/kolab-n
++ distribution directory: /kolab/RPM/TMP/openpkg-2.1.2-2.1.2.src
++ platform product:    ix86-debian3.1
++ platform technology: i686-linux2.6
++ platform support:    tentative (should already work)
./openpkg.boot:FAILED: required [GNU] C/C++ compiler not found
/tmp/obmtool.7103.tmp: line 2: /kolab/RPM/PKG/openpkg-2.1.2-2.1.2.*-*-*.sh: 
Datei oder Verzeichnis nicht gefunden
obmtool:ERROR: bootstrapping failed

Is there a failure in the distribution package or is it really missing the 
matching gcc in my _OS_-enviroment? And what's the required compiler??

And what's up with the next error message? openpkg-2.1.2-2.1.2.*-*-*.sh not 
found?
At the moment, I don't know where to look at and to do what! This 
openpkg-thing is completely new to me!!

Thanks in advance

Greets
Stefan