11. 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.

11.1 Specifying the System Type		Specifying the system type
11.2 Getting the Canonical System Type		Getting the canonical system type
11.3 Using the System Type		What to do with the system type