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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.
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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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