diff -Naur crackle-0.1/Makefile crackle-0.1-patched/Makefile
--- crackle-0.1/Makefile	2013-02-15 01:04:24.000000000 -0500
+++ crackle-0.1-patched/Makefile	2014-03-05 11:30:20.907003818 -0500
@@ -4,13 +4,13 @@
 
 OBJS = crackle.o aes.o aes-ccm.o aes-enc.o test.o
 
-CFLAGS  = -Wall -Werror -g
-LDFLAGS = -lpcap
+CFLAGS  ?= -Wall -Werror -g
+LDFLAGS ?= 
 
 all: crackle
 
 crackle: $(OBJS)
-	$(CC) -o crackle $(OBJS) $(LDFLAGS)
+	$(CC) $(CFLAGS) -o crackle $(OBJS) -lpcap $(LDFLAGS)
 
 install: crackle
 	$(INSTALL) -m 0755 crackle $(INSTALL_DIR)