No freebusy / kolab package depends on old roundcubemail packages

Hi all,

today I notices I do not have installed the Freebusy functionality since 
the conversion to the new selfcontained packaging for roundcube. The 
packages "kolab" and "kolab-freebusy" are not installed.

But if I try to install kolab, it wants to install:
###
The following NEW packages will be installed:
   kolab kolab-freebusy kolab-webclient 
roundcubemail-plugin-kolab-delegation roundcubemail-plugins-kolab
###
That won't work as it conflicts with roundcubemail 1.5.3-0~kolab1.

Do I miss something here?

kolab depends on kolab-webclient, which depends on 
roundcubemail-plugin-kolab-delegation, which should get offered by the 
new selfcontained roundcubemail package?

The thing is, there are others which do use this. Aren't there? How to 
you have solved this problem?

regards
hede