how to cross architecture build a package

Hi

trying to build a i386 package on a amd64 machine and i keep getting

dpkg-gencontrol: error: current host architecture 'amd64' does not appear in package's architecture list (i386)

I am using debhelper to build the packages and I have tried dh_gencontrol -- -VArch=i386

but doesn't seem to be the way to go forward.

thanks
Alex

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