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
build_alias, host_alias, target_alias
config.guess was used;
build_cpu, build_vendor, build_os
host_cpu, host_vendor, host_os
target_cpu, target_vendor, target_os
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