Just for coherency:
1. If I'm right then you are porting an app to the specific Amiga environment.
2. You have the complete source of the project.
3. While compiling you are confronted with a message that a specific file can't be found for inclusion.
Do you HAVE that file in question?
If NO then try to locate that file on the internet.
If YES then put it in the include path or extend the include path so that the preproc can get at it. The environment setting of your project provides for this.
I hope that I've been of some help to you
Regards,
Tjitte