Corrrect way to tell: Build-Depends: libfoo (>= 0.x), libfoo (<< 0.y)

[Daniel Leidert <daniel.leidert.spam@gmx.net>]

Hello,

In order to avoid an FTBFS bug report [1] reported during a transition
period I'm wondering if I can tell the following via debian/control:

build-depend on a library >= 0.x and << 0.y 

What would be the correct way?

Build-Depends: library (>= 0.x)
Build-Conflicts: library (<< 0.y)

This would of course still lead to a FTBFS, but it would be more clear,
why it fails. Is the above solution ok?

[1] http://bugs.debian.org/450442

Regards, Daniel