1. downloaded and installed xcode to 4.3.3 on build machines
-- at the end of installation, removed the old 4.2 installation
2. downloaded and installed command line tool
3, downloaded and installed auxiliary tool (to get PackageMaker)
-- PackageMaker is a separate installation. Get it from:
Double-click on the disk image.
-- From a terminal window, open up the Applications folder inside Xcode so it shows up in the Finder.
% open /Applications/Xcode.app/Contents/Applications/
Copy PackageMaker.app from the disk image to here.
-- Create symlinks so the install part of the build will work.
% cd /Applications/Xcode.app/Contents/Developer/usr/bin
% ln -s /Applications/Xcode.app/Contents/Applications/PackageMaker.app/Contents/MacOS/PackageMaker
% ln -s /usr/libexec/PlistBuddy
-- For the signing part of the build, use
% productsign --sign "Developer ID Installer" --keychain InstallerSigning.keychain /path/to/.pkg /path/to/output_file