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 4.4.2 Generic Header Checks
 ---------------------------
 
 These macros are used to find system header files not covered by the
 particular test macros.  If you need to check the contents of a header
 as well as find out whether it is present, you have to write your own
 test for it ( Writing Tests).
 
  -- Macro: AC_CHECK_HEADER (HEADER-FILE, [ACTION-IF-FOUND [,
           ACTION-IF-NOT-FOUND]])
      If the system header file HEADER-FILE exists, execute shell
      commands ACTION-IF-FOUND, otherwise execute ACTION-IF-NOT-FOUND.
      If you just want to define a symbol if the header file is
      available, consider using `AC_CHECK_HEADERS' instead.
 
  -- Macro: AC_CHECK_HEADERS (HEADER-FILE... [, ACTION-IF-FOUND [,
           ACTION-IF-NOT-FOUND]])
      For each given system header file HEADER-FILE in the
      whitespace-separated argument list that exists, define
      `HAVE_HEADER-FILE' (in all capitals).  If ACTION-IF-FOUND is
      given, it is additional shell code to execute when one of the
      header files is found.  You can give it a value of `break' to
      break out of the loop on the first match.  If ACTION-IF-NOT-FOUND
      is given, it is executed when one of the header files is not found.
 
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