dovecot - Dec 2011 - compile dovecot-sieve for dovecot 1.2.9 (ubuntu pkg)

Cheers,

I've a running Dovecot 1.2.9, installed from the ubuntu 10.04 Lucid LTS 
repository and trying to get the dovecot-sieve plugin (which seems to be 
not included in the lucid repo) compiled.
Method 1 listed in http://wiki.dovecot.org/LDA/Sieve/Dovecot wont work, 
seems the rpm was build without --enable-header-install
Is it sufficient to download the sources from 
http://archive.ubuntu.com/ubuntu/pool/main/d/dovecot/dovecot_1.2.9.orig.tar.gz
and use them for ./configure --with-dovecot=$path ?

thanks and happy holidays
julien