Example of default rules file

# Define suffixes that make knows.
.SUFFIXES:  .o .C .C\~ .c .c~ .f .f~ .y .y~ .l .l~ .s .s~ .sh .sh~ .h .h~ .a
 #Begin macro definitions for
#internal macros
YACC=yacc
YFLAGS=
ASFLAGS=
LEX=lex
LFLAGS=
CC=cc
CCC=xlC
AS=as
CFLAGS=
CCFLAGS=
# End macro definitions for
# internal macros
# Create a .o file from a .c
# file with the cc program.
c.o:
         $(CC) $(CFLAGS) -c $<

# Create a .o file from
# a .s file with the assembler.
s.o:
         $(AS)$(ASFLAGS) -o $@ $<

.y.o:
# Use yacc to create an intermediate file
         $(YACC) $(YFLAGS) $<
# Use cc compiler
         $(CC) $(CFLAGS) -c y.tab.c
# Erase the intermediate file
         rm y.tab.c
# Move to target file
         mv y.tab.o $@.
.y.c:
# Use yacc to create an intermediate file
         $(YACC) $(YFLAGS) $<
# Move to target file
         mv y.tab.c $@