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(autoconf.info)Header Files

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Header Files
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   The following macros check for the presence of certain C header
files.  If there is no macro specifically defined to check for a header
file you need, and you don't need to check for any special properties of
it, then you can use one of the general header-file check macros.

Particular Headers

Special handling to find certain headers

Generic Headers

How to find other headers