GNU Info

(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.