all: myapp# Which compilerCC = gcc# Where to installINSTDIR = /usr/local/bin# Where are include files keptINCLUDE = .# Options for developmentCFLAGS = -g -Wall -ansi# Options for release# CFLAGS = -O -Wall -ansimyapp: main.o 2.o 3.o	$(CC) -o myapp main.o 2.o 3.omain.o: main.c a.h	$(CC) -I$(INCLUDE) $(CFLAGS) -c main.c2.o: 2.c a.h b.h	$(CC) -I$(INCLUDE) $(CFLAGS) -c 2.c3.o: 3.c b.h c.h	$(CC) -I$(INCLUDE) $(CFLAGS) -c 3.cclean:	-rm main.o 2.o 3.oinstall: myapp	@if [ -d $(INSTDIR) ]; \	then \		cp myapp $(INSTDIR);\		chmod a+x $(INSTDIR)/myapp;\		chmod og-w $(INSTDIR)/myapp;\		echo "Installed in $(INSTDIR)";\	else \		echo "Sorry, $(INSTDIR) does not exist";\	fi