--- a/Makefile
+++ b/Makefile
@@ -3,16 +3,13 @@
 #CC  = /usr/local/bin/g++
 #CC  = /usr/bin/g++
 
-CFLAGS = -O2 -Wall -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64
-
-.c.o:
-	gcc $(CFLAGS) -c $<
+CFLAGS += -Wall
+CPPFLAGS += -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64
 
 OBJECT =\
 combine_wave.o
 
-a.out : $(OBJECT)
-	gcc -o combine_wave  $(OBJECT)
+all: combine_wave
 		
 # DEPENDENCIES
 combine_wave.o : combine_wave.c combine_wave.h wave_header.h