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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

Using System Type

What to do with the system type