### 2.1 libfko Header ¶

All interfaces (data types and functions) of the library are defined in the header file ‘fko.h’. You must include this in all programs using the library, either directly or through some other header file, like this:

    #include <fko.h>

The name space of FKO is `fko_*` for function names and data types and `FKO_*` for other symbols. Other symbols internal to FKO may take the form `_fko_*` and `_FKO_*`.