Depending on a package with an option?

[manu%netbsd.org@localhost (Emmanuel Dreyfus)]

David Holland <dholland-pkgtech%netbsd.org@localhost> wrote:

>  > configure: error: could not locate libtool ltdl.h
>  > 
>  > This is provided by the libtool-base package, but I have no idea how to
>  > have its include poping up in ${WRKDIR}/.buildlink. Any hint?
> 
> devel/libltdl/buildlink3.mk?

Thank you, and now I have another one:

How do I make a dependency on another package option? I am adding 
1) a dso option to openldap-server
2) a package for a slapd module

The module package needs openldap-server to have been built with the dso
option. How can it be enforced?

-- 
Emmanuel Dreyfus
http://hcpnet.free.fr/pubz
manu%netbsd.org@localhost