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    You might also need to check for the existence of files.  Before
 using these macros, ask yourself whether a run-time test might not be a
 better solution.  Be aware that, like most Autoconf macros, they test a
 feature of the host machine, and therefore, they die when
 cross-compiling.
 
  - Macro: AC_CHECK_FILE (FILE, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
      Check whether file FILE exists on the native system.  If it is
      found, execute ACTION-IF-FOUND, otherwise do ACTION-IF-NOT-FOUND,
      if given.
 
  - Macro: AC_CHECK_FILES (FILES, [ACTION-IF-FOUND],
           [ACTION-IF-NOT-FOUND])
      Executes `AC_CHECK_FILE' once for each file listed in FILES.
      Additionally, defines `HAVE_FILE' ( Standard Symbols) for
      each file found.
 
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