--- a/Makefile
+++ b/Makefile
@@ -18,8 +18,8 @@ LIB_DIR = lib
 BIN_DIR = bin
 
 # Depenencies
-PERFUTILS=../PerfUtils
-COREARBITER=../CoreArbiter
+PERFUTILS ?=../PerfUtils
+COREARBITER ?=../CoreArbiter
 INCLUDE=-I$(PERFUTILS)/include -I$(COREARBITER)/include -I$(SRC_DIR)
 LIBS=$(COREARBITER)/lib/libCoreArbiter.a $(PERFUTILS)/lib/libPerfUtils.a -lpcrecpp -pthread
 CLIBS=$(LIBS) -lstdc++