Restricting binary (sub)package from single source package

[Mathieu Malaterre <mathieu.malaterre@gmail.com>]

Hi,

  Could someone let me know what I should do when a binary package is
restricting me to a subset of architecture ? For instance libvtkgdcm
requires libvtk5-dev, but not libgdcm-tools. How can I express that in
my single control file for gdcm ?

Ref:
http://packages.qa.debian.org/g/gdcm.html

Thanks

-- 
Mathieu