I'm sorry if this is a stupid question, but I'm new in makefile. I have two file hello.c and hello.h When I implement in terminal of ubutu by command: gcc -o hello hello.c it is ok because hello.o is created. However, when I write a makefile whose content: CC=make CFLAGS=-I hell.o : hello.c gcc-c hello.o And then, I invoke makefile by command "make". Terminal informs: "***missing separator. Error 127. I don't know how to fix it. Please help me,thank for all.