Running kde4 applications in the kde3 desktop

Thiago Macieira thiago at
Sat Mar 25 13:37:59 GMT 2006

Cornelius Schumacher wrote:
>On Friday 24 March 2006 20:32, Thiago Macieira wrote:
>> Olivier Goffart wrote:
>> >But this is IMO a severe problem that need to be fixed.
>> We will drop DCOP support in KDE4 before we release it.
>> As for ksycoca, there is no solution. Your KDE 3 apps and your KDE 4
>> apps cannot share the database. You must set up separate KDEHOME and
>What's the exact reason that makes it impossible to have KDE 4 apps run
> nicely on a KDE 3 desktop now? It's annoying to have to use several
> magic variables, separate users or whatever to be able to develop KDE 4
> apps.

Well, I'd guess it's the fact that we haven't done that assessment yet.

So we're overwriting the sycoca database with a new and probably 
incompatible version. It's the same issue you face every time you upgrade 
KDE: the sycoca database version changes. You mustn't downgrade KDE after 
you upgrade it.

But for KDE 4, I guess we'll have to put some effort into ensuring both 
worlds still work. I don't have much hopes for both worlds communicating 
with each other, though.

Thiago Macieira  -  thiago (AT) - thiago (AT)
  thiago.macieira (AT)     Trolltech AS
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