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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.
5.6.1 Portability of Headers Collected knowledge on common headers 5.6.2 Particular Header Checks Special handling to find certain headers 5.6.3 Generic Header Checks How to find other headers