One Source with Different Build Dependancies?

[ms419]

I am packaging source which builds two binary packages; however, each 
package has different build dependancies. In fact, the packages' build 
dependancies conflict.

I don't think the dpkg tools have the facility to build one binary but 
not the other. Nor do I think one can specify different build 
dependancies for two binaries built from the same source.

Could someone please refer me to any discussion of these issues, and 
any solutions?

Thanks very much!

Jack