I have a query regarding RTC library for arduino. I am working on a project called intellogent letter box. I am referring "Intelligent letter box using arduino and gsm by muddasar khan of engineers garage. When it compiled his program, i got an error saying that " #include <RTClib.h> : no such file or directory found"
" project_postbox.ino:3:20: fatal error: RTClib.h: No such file or directory