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5.6 Header Files
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 |