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(autoconf.info)Manual Configuration

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Manual Configuration
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   A few kinds of features can't be guessed automatically by running
test programs.  For example, the details of the object file format, or
special options that need to be passed to the compiler or linker.  You
can check for such features using ad-hoc means, such as having
`configure' check the output of the `uname' program, or looking for
libraries that are unique to particular systems.  However, Autoconf
provides a uniform method for handling unguessable features.

Specifying Names

Specifying the system type.

Canonicalizing

Getting the canonical system type.

System Type Variables

Variables containing the system type.

Using System Type

What to do with the system type.