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.
|• Header Portability||Collected knowledge on common headers|
|• Particular Headers||Special handling to find certain headers|
|• Generic Headers||How to find other headers|