Specifying ia32-libs in control when on a 64 bit Debian/Ubuntu?

[Ignacio Valdes <ivaldes@hal-pc.org>]

Hi all,

I have a deb package that requires ia32-libs to run on a 64-bit
Debian/Ubuntu, otherwise it works without it on i386. I have tried in
the control file:

Depends: ia32-libs [amd64]

But that doesn't seem valid. How does one specify ia32-libs should be
a dependency when on 64 bit?

Thanks!

-- IV