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 Results of Tests
 ****************
 
    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.
 

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* 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.
 

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