My first make file that worked as I wanted. Will use this for future references.

makefile

CC = gcc
CFLAGS = -lm

all: mm1

backup:
	cd .. && zip chap1_c_backup.zip chap1_c/*

mm1: lcgrand.o mm1.o
	@echo making everything nice and sweet to mm1
	gcc -o mm1 mm1.o lcgrand.o -lm

lcgrand.o: lcgrand.c
	@echo compiling lcgrand.c file to lcgrand.o
	gcc -c lcgrand.c

mm1.o: mm1.c
	@echo compiling mm1.c file to object file mm1.o
	gcc -c mm1.c

clean:
	@echo removing garbages
	rm mm1.o lcgrand.o mm1

help:
	@echo type make help for this message
	@echo type make clean to clean object files
	@echo type make backup to make backup file of this work folder
	@echo type make mm1 to make executable