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 (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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