The error "arrays.h: not such file or directory" using Borgelt's Apriori

Question

I'm using the Borgelt's code of Apriori, with the Cgwin toolchain in Eclipse and Windows 11. But when I want to build the project, it returns the following error: "arrays.h: not such file or directory". That header is not recognized and I don't know why. It is located in the folder util/src. In fact, the file array.c,that is located in the same folder, doesn't recognize its own header array.h. How can I fix that error?

I tried to specify the directory using #include "../util/src/array.h" but the error prevails.