how to define a prefix

[Oleg]

On Fri, Mar 09, 2012 at 11:28:17AM +0100, Ondrej Zajicek wrote:
> On Fri, Mar 09, 2012 at 02:03:44PM +0400, Oleg wrote:
> >   Hello.
> > 
> >   When I want to define a prefix:
> > 
> > define our_net = 192.168.110.0/24;
> > 
> >   "bird> configure" says me:
> > 
> >   /etc/bird.conf, line 18: syntax error.
> 
> Unfortunately, define only allows numerical constants.

  Hm. I thought define behave like C define preprocessor directive.
I thought that a content of defined variables is placed before a main
config processing.