If the package segfaults immediately (which happened to me last time I tried this), then it should be removed from -proposed.
If the package isn't showing up in Applications->Add Applications after it's built for amd64, then the problem there is in Gnome-App-Install (Wine had a similar issue when it added support for amd64)
If the package segfaults immediately (which happened to me last time I tried this), then it should be removed from -proposed.
If the package isn't showing up in Applications->Add Applications after it's built for amd64, then the problem there is in Gnome-App-Install (Wine had a similar issue when it added support for amd64)