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(autoconf.info)System Type Variables

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System Type Variables
=====================

   After calling `AC_CANONICAL_SYSTEM', the following output variables
contain the system type information.  After `AC_CANONICAL_HOST', only
the `host' variables below are set.

``build', `host', `target''
     the canonical system names;

``build_alias', `host_alias', `target_alias''
     the names the user specified, or the canonical names if
     `config.guess' was used;

``build_cpu', `build_vendor', `build_os''
``host_cpu', `host_vendor', `host_os''
``target_cpu', `target_vendor', `target_os''
     the individual parts of the canonical names (for convenience).