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 O gcc info.o main.o -o project gcc -c info.c main.c O gcc -c info.h info.c main.c gcc info.o main.o -o project O gcc -c info.c main.c gcc info.o main.o -o project O gcc info.o main.o -o project goc -c info.h info.c main.c