'API' undeclared identifiers

I'm trying to access the "stdio.h" file but get an error message, 'API' undeclared identifiers. It specifically mentions line 212 of stdio.h. I included stdio.h by, #include <stdio.h>. I'm not sure how to access and use this header file. I'm also saving my script as a .c file.

Is it linked or added? Also inside stdio.h it calls for
#include <stdarg.h> ... check in stdio.h about line 77. Do you have any more info, you could be doing a lot of different things, some things that the engine may not even support. If your playing with win API dont forget to include windows.h

I'm trying to run the following code but still receive error messages after including these two header files. I looked for stdarg.h in the include folder but couldn't find it.
#include <windows.h>
#include <stdio.h>


main()
{
printf ("Howdy, neighbor! This is my first C program. \n");
return 0;
}
Thanks for your help.

So, you do not want API? I misunderstood. For your example I believe the only includes you need are

#include <acknex.h>
#include <default.c>

There are some programming tutorials starting in AUM 67 for A7 lite-c. I think once you start reading those you will undertsand right away