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B.4.3 Predefined environment variables

There are two environment variables predefined for use in environment substitutions:

VER
Defined as the version number of PSPP, as a string, in a format something like 0.9.4.
ARCH
Defined as the host architecture of PSPP, as a string, in standard cpu-manufacturer-OS format. For instance, Debian GNU/Linux 1.1 on an Intel machine defines this as i586-unknown-linux. This is somewhat dependent on the system used to compile PSPP.

Nothing prevents these values from being overridden, although it's a good idea not to do so.