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 12.1 Autoconf Background
 ========================
 
 As explained elsewhere ( The GNU Autoconf Manual (autoconf)Top.),
 any package needs configuration at build-time.  If your package uses
 Guile (or uses a package that in turn uses Guile), you probably need to
 know what specific Guile features are available and details about them.
 
    The way to do this is to write feature tests and arrange for their
 execution by the `configure' script, typically by adding the tests to
 `configure.ac', and running `autoconf' to create `configure'.  Users of
 your package then run `configure' in the normal way.
 
    Macros are a way to make common feature tests easy to express.
 Autoconf provides a wide range of macros ( Existing Tests
 (autoconf)Existing Tests.), and Guile installation provides
 Guile-specific tests in the areas of: program detection, compilation
 flags reporting, and Scheme module checks.
 
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