15.6 Specifying the System Type
There may be some features configure cannot figure out
automatically, but needs to determine by the type of machine the package
will run on. Usually, assuming the package is built to be run on the
same architectures, configure can figure that out, but
if it prints a message saying it cannot guess the machine type, give it
the --build=type option. type can either be a
short name for the system type, such as ‘sun4’, or a canonical name
which has the form:
where system can have one of these forms:
See the file config.sub for the possible values of each field.
If config.sub isn't included in this package, then this package
doesn't need to know the machine type.
If you are building compiler tools for cross-compiling, you
should use the option --target=type to select the type of
system they will produce code for.
If you want to use a cross compiler, that generates code for a
platform different from the build platform, you should specify the
host platform (i.e., that on which the generated programs will
eventually be run) with --host=type.