How to compile amd64 package from i386 source

["spp mg" <sm.sppmg@gmail.com>]

hi all

 

How to compile amd64 package from i386 source?

 

I would like use gstreamer0.10-pitfdll (and other.....)but it's only supply i386 package.

How can I compile?

 

And ,How can I know I succeed?

 

thanks.