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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 (see section 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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