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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.

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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