diff --git a/Makefile b/Makefile
index 486ec17..35d8a85 100644
--- a/Makefile
+++ b/Makefile
@@ -304,9 +304,11 @@ shared_jni_lib: picotcp $(ZTO_OBJS)
 tests: selftest nativetest ztproxy
 # intercept
 
+ZT_UTILS:=zto/node/Utils.cpp -Izto/node
+
 selftest:
 	$(CXX) $(CXXFLAGS) -D__SELFTEST__ $(STACK_DRIVER_FLAGS) $(LIBZT_FLAGS) \
-		$(SANFLAGS) $(LIBZT_INCLUDES) $(ZT_INCLUDES) test/selftest.cpp -o \
+		$(SANFLAGS) $(LIBZT_INCLUDES) $(ZT_INCLUDES) $(ZT_UTILS) test/selftest.cpp -o \
 		$(BUILD)/selftest -L$(BUILD) -lzt -lpthread
 	@./check.sh $(BUILD)/selftest
 nativetest:
diff --git a/make-liblwip.mk b/make-liblwip.mk
index 3ee8f08..e79ae4d 100644
--- a/make-liblwip.mk
+++ b/make-liblwip.mk
@@ -120,7 +120,7 @@ LWIPFILESW=$(wildcard $(LWIPFILES))
 LWIPOBJS=$(notdir $(LWIPFILESW:.c=.o))
 
 %.o:
-	$(CXX) $(CFLAGS) -c $(<:.o=.c) -o obj/$@
+	$(CXX) $(CFLAGS) -Wno-deprecated -c $(<:.o=.c) -o obj/$@
 
 all:
 .PHONY: all
@@ -136,4 +136,4 @@ liblwip.a: clean $(LWIPOBJS)
 	#libtool -static -o $@ $^
 
 .depend: $(LWIPFILES)
-	$(CCDEP) $(CFLAGS) -MM $^ > .depend || rm -f .depend
\ No newline at end of file
+	$(CCDEP) $(CFLAGS) -x c -MM $^ > .depend || rm -f .depend
\ No newline at end of file
diff --git a/test/selftest.cpp b/test/selftest.cpp
index 2e95dc3..f97fcfe 100644
--- a/test/selftest.cpp
+++ b/test/selftest.cpp
@@ -49,7 +49,10 @@
 #include <signal.h>
 
 #include "libzt.h"
+
+#if defined(__SELFTEST__)
 #include "Utils.hpp"
+#endif
 
 #define EXIT_ON_FAIL           false
 
@@ -258,9 +261,13 @@ void wait_until_tplus_s(long int original_time, int tplus_s)
 
 int rand_in_range(int min, int max)
 {
+#if defined(__SELFTEST__)
 	unsigned int seed;
 	ZeroTier::Utils::getSecureRandom((void*)&seed,sizeof(seed));
 	srand(seed);
+#else
+	srand((unsigned int)time(NULL));
+#endif
 	return min + rand() % static_cast<int>(max - min + 1);
 }
 
@@ -2116,7 +2123,7 @@ void* worker_create_socket(void *arg)
 // test the core locking logic by creating large numbers of threads and performing random operations over an extended period of time
 void multithread_test(int num_iterations, bool *passed)
 {
-	int err = 0, i = 0;
+	int err = 0;
 	fprintf(stderr, "\n\nmultithread_socket_creation\n\n");
 	// test zts_socket() and zts_close()
 	for (int j=0; j<num_iterations; j++) {