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The following macros check for particular C library functions. If there is no macro specifically defined to check for a function you need, and you don't need to check for any special properties of it, then you can use one of the general function-check macros.
5.5.1 Portability of C Functions Pitfalls with usual functions 5.5.2 Particular Function Checks Special handling to find certain functions 5.5.3 Generic Function Checks How to find other functions
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