--- Makefile.orig	2019-07-23 21:17:28 UTC
+++ Makefile
@@ -2,7 +2,7 @@ all: arpoison
 
 arpoison: arpoison.c
 
-	gcc -lnet -o arpoison `libnet-config --defines` -I/opt/local/include -L/opt/local/lib arpoison.c
+	$(CC) -o arpoison `libnet-config --defines --cflags --libs` arpoison.c
 
 clean: