(autoconf.info)Manual Configuration

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13 Manual Configuration

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

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