ppa build fails for amd64 but succeeds for i386

[berndporr]

I've created a debian source package and uploaded that to the launchpad ppa. It builds fine for i386 but fails for amd64:
https://launchpadlibrarian.net/10299...UILDING.txt.gz
https://launchpadlibrarian.net/10299...TOBUILD.txt.gz

the error is:
dpkg-shlibdeps: error: couldn't find library libcomedi.so.0 needed by debian/comedirecord/usr/bin/comedirecord (ELF format: 'elf32-i386'; RPATH: ''). dpkg-shlibdeps: error: couldn't find library libiir.so.1 needed by debian/comedirecord/usr/bin/comedirecord (ELF format: 'elf32-i386'; RPATH: ''). dpkg-shlibdeps: error: couldn't find library libQtGui.so.4 needed by debian/comedirecord/usr/bin/comedirecord (ELF format: 'elf32-i386'; RPATH: ''). dpkg-shlibdeps: error: couldn't find library libQtCore.so.4 needed by debian/comedirecord/usr/bin/comedirecord (ELF format: 'elf32-i386'; RPATH: ''). dpkg-shlibdeps: error: couldn't find library libpthread.so.0 needed by debian/comedirecord/usr/bin/comedirecord (ELF format: 'elf32-i386'; RPATH: ''). dpkg-shlibdeps: error: couldn't find library libstdc++.so.6 needed by debian/comedirecord/usr/bin/comedirecord (ELF format: 'elf32-i386'; RPATH: ''). dpkg-shlibdeps: error: couldn't find library libm.so.6 needed by debian/comedirecord/usr/bin/comedirecord (ELF format: 'elf32-i386'; RPATH: ''). dpkg-shlibdeps: error: couldn't find library libgcc_s.so.1 needed by debian/comedirecord/usr/bin/comedirecord (ELF format: 'elf32-i386'; RPATH: ''). dpkg-shlibdeps: error: couldn't find library libc.so.6 needed by debian/comedirecord/usr/bin/comedirecord (ELF format: 'elf32-i386'; RPATH: '').
seems so that shlibdeps is looking for the 32 bits libraries.

Any ideas why this is the case?

[MadCow108]

is there something even building in those logs?
I don't see any output but maybe thats some qt thing.

if possible enable a verbose build, it might give some clues.
can you post a link to the source/ppa?

[bregma]

Are you by any chance trying to package a pre-built binary? That's what the logs are telling me. That will, of course, fail.