--- Makefile	2008-12-25 21:40:38.000000000 +0100
+++ Makefile.oden	2008-12-25 21:42:44.000000000 +0100
@@ -1,3 +1,7 @@
+CFLAGS = -Wall
+LIBS = -lnetpbm -lm
+LDFLAGS = 
+
 ppmtocpva: ppmtocpva.c
-	gcc ${CFLAGS} -o ppmtocpva  ppmtocpva.c -lnetpbm -lm
+	gcc $(CFLAGS) $(LDFLAGS) -o ppmtocpva  ppmtocpva.c $(LIBS)