The right way to depend on a package's extra feature

[Vasil Dimov]

On Fri, Aug 05, 2005 at 03:10:10AM -0400, Adam Weinberger wrote:
> Vasil Dimov wrote:
> >Hi list,
> >
> >What it the right way to make a port that depends on other port, but
> >that other port must be built with some extra feature?
> >
> >For example, imagine we have port "A" that installs
> >/foo/bar/great_feature only if it is build with
> >'make WITH_GREAT_FEATURE=yes'
> >
> >Then we have port "B" that happens to depend on /foo/bar/great_feature.
> >
> >You see, there are two problems here:
> >
> >1. We cannot pass WITH_GREAT_FEATURE=yes via the RUN_DEPENDS technology,
> >   only the target may be specified: RUN_DEPENDS=/file:portdir:target
> >   needed command: make -C portdir WITH_GREAT_FEATURE=yes target
> >
> >2. Port A may have already been installed without WITH_GREAT_FEATURE=yes
> >   This will cause make WITH_GREAT_FEATURE=yes install in A's dir to fail
> >   with error "already installed"
> >   needed command: portupgrade -f -m WITH_GREAT_FEATURE=yes /var/db/pkg/A
> >   (huh! we used portupgrade, not very nice...)
> >
> >Any suggestions? Did I miss something?
> 
> I have that same problem with deskutils/gourmet. It needs a metakit 
> built with python support, but python support is disabled by default. 
> You can see what I've done as a kludge in deskutils/gourmet/Makefile, 
> but the best solution would be to separate metakit into a master/slave
> port thing so you can just depend on metakit-python and be done with it.
> 
> Does this parallel your situation any?
> 

Yes, but I am looking for solution that:
* does not change the port we depend on (in your case metakit)
* does not devolve the flow-control to the user saying "I cannot manage
  with this situation, you have to do manually this and this".
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