How to set arch for stage-packages?

[Andrey Rogovsky]

Hi!
I need add few i386 packages to support my 32bit binary for amd64 systems:
...
parts:
  packages:
   plugin: nil
   stage-packages:
     - libstdc++6:i386
...
But when I try pull - I get error:
# snapcraft pull
Skipping pull bluequest (already ran)
Preparing to pull packages
Hit http://ppa.launchpad.net/snappy-dev/tools/ubuntu xenial InRelease


Get:1 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]


Hit http://ua.archive.ubuntu.com/ubuntu xenial InRelease


Hit http://ua.archive.ubuntu.com/ubuntu xenial-updates InRelease


Hit http://ua.archive.ubuntu.com/ubuntu xenial-backports InRelease


Fetched 102 kB in 0s (0 B/s)


Error downloading stage packages for part 'packages': no such package
'libstdc++6:i386'

Please advice.

P.S. I dont need build i386 package.
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