Your program contains 3 files: info.h, info.c, main.c. You also added a correct makefile. What is the output of executing the command (make) for first time gcc-c info.c main.c gcc info.o main.o -o project gcc info.o main.o -o project gcc-c info.h info.c main.c gcc info.o main.o -o project gcc -c info.c main.c gcc-c info.h info.c main.c gcc info.o main.o-o project