[Q] How can I prevent the installation of a package?

• You can prevent the installation of a package through an InstallationCheck script, VolumeCheck script (or Requirements).

  —	For InstallationCheck scripts, return a value greater than or equal to 64.
  —	For VolumeCheck scripts, return a value greater than or equal to 32. A VolumeCheck script will prevent the installation of a package if no volumes can be used as the target of the installation.

[Q] How can I prevent my package from being installed on a PowerPC (or Intel) based Mac?

• You can do this for instance through an InstallationCheck script. Check the value returned by /usr/bin/arch (1) or /usr/sbin/sysctl (1) for hw.cputype and return 64 if the architecture or cpu is not the supported one.