Apple PackageMaker CLI: Is there any way to include Postinstall Actions?

I have a PackageMaker .pmdoc designed in the PackageMaker GUI. The top level package item on the s开发者_开发知识库idebar (above the contents) has two Postinstall Actions. They're "Open File" actions.

When I build the package inside the PackageMaker GUI, the resulting .mpkg includes: Contents/Packages/packagenamePostflight.pkg

But when I build the package with the CLI, the Postflight.pkg is missing.

I built with the CLI using the command:

/Developer/usr/bin/packagemaker --doc package.pmdoc/ --out package.mpkg

At the top of the output, it tells me:

packagemaker[55900:903] Warning: unknown or deprecated action packagemaker[55900:903] Warning: unknown or deprecated action

Google tells me others have encountered this problem in the past, without finding a solution: http://lists.apple.com/archives/Installer-dev/2010/Jan/msg00003.html

Anyone have any ideas besides not using PackageMaker?

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You may want to consider abandoning PackageMaker. I just switched to Iceberg and although it has its own quirks, I found it smarter when it dealt with post installation tasks.