I am trying to find this config.h header in the dvdbackup source code. It's my guess it's auto generated by the configure script or a Makefile. I am wanting to gut as much of this as possible to work just for my system. I am not a developer and I am not bothering them. I don't need portability or __cplusplus defines. Most of the C code makes sense if I can track it, but the preprocessor functions, no. I don't do preprocessing, never looked into it.
This is some kind of universal standards someone has wisely put into this code. But my idea is to gut as much as possible.
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