Lyx Docbook

[Juergen Kleiminger]

Dear Users,

Cofiguring the new lyx 1.1.6  I cannnot find the textclass docbook.
This message  appears :
+checking for docbook  class docbook-book...  no
checking for docbook  class docbook...  no
Where can I find these classes.

Greetings from  Emden Harbour ( Germany),
Jürgen Kleiminger