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6 Results of Tests
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Once 'configure' has determined whether a feature exists, what can it do
to record that information?  There are four sorts of things it can do:
define a C preprocessor symbol, set a variable in the output files, save
the result in a cache file for future 'configure' runs, and print a
message letting the user know the result of the test.

Defining Symbols

Defining C preprocessor symbols.

Setting Output Variables

Replacing variables in output files.

Caching Results

Speeding up subsequent 'configure' runs.

Printing Messages

Notifying users of progress or problems.