During the creation of the DVD, the file eindeutig.c was capitalized to Eindeutig.c.
Since the compilation process is usually case sensitive, the tool will not compile correctly.
To fix this problem you can either modify the Makefile file and change the 'e' to 'E',
or you can simply rename Eindeutig.c to eindeutig.c.

Thank you to Mike Harrington for finding this error.