Hello. I'm suffering from this problem. Had anyone here dealt with it before, if so please help me. I'm running out of the time.
I already downloaded
cont_ad.h to sphinxbase library but nothing has changed. Anyway, I'm afraid that the version of the file that I downloaded doesn't match with the version of sphinxbase that I have.
Concerning the guide I'm following, it is a book by Richard Grimmett called Raspberry Pi Robotic Projects.