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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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