Re: How to depend on a system optionally?

hello;

in order to manage a system for multiple runtimes, each of which  
entails it's own foreign libraries, i have found it useful to add a  
constraint called "contingent-on". this may-or-may-not be what you  
intend with "optionally-depend-on". i have found it useful to express  
the constraints:

  "if a feature|system is present, then this system|component is  
required, and depends on it."


On 2009-05-18, at 14:28 , Tobias C. Rittweiler wrote:

>
> I've read several times that it's a head ache to configure optional
> dependencies with ASDF.
>
> How true is that? Could we perhaps provide another clause
> :OPTIONALLY-DEPEND-ON in DEFSYSTEM which would load a system only if
> available?
>
> Reason is that I'm going to revive
>
>   http://common-lisp.net/project/hyperdoc/
>
> which is a good example of a natural optional dependency. And I'd like
> to make its inclusion as easy as possible so it'll see widespread
> adoption.
>
> Thanks!,
>
>   -T.
>
>
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