Is there a command line tool?

The command line tool freeze can be used to build a project from the shell.

1 Launch the Terminal application.
2 Type freeze
3 Drag and drop the Iceberg project from the Finder to the Terminal window.
4

Launch the build by pressing Return.
Note: If you launch the tool with no arguments, the freeze usage will be displayed.
Example:

$ freeze
usage: freeze [-v] [-d ]  file ...
$ freeze /Users/peter/Documents/PackInstall/PackInstall.packproj