Would you mind uploading that CSV file? It contains all addresses, even with no balance, right?
I've alredy tried to compile your code but I'm getting errors related to gmp library. If you can upload that I wouldn't mind reuploading to my own http server so it can be accessed to others.
I can't for the moment & until the end of the week unfortunately.
If you have gmp librairies & headers installed, secp256k1 will use it. You'll have to edit the main Makefile and add "-lgmp" in the LDFLAGS line. It will build the binary using it.