Fix build flags for unit in darwin

Author: danielinux

Makefile

@@ -110,7 +110,12 @@ asan:LDFLAGS+=-static-libasan
 
 # Test
 
-unit:LDFLAGS+=-lcheck -lm -lpthread -lrt -ldl -lsubunit
+UNIT_LIBS=-lcheck -lm -lpthread -lrt -ldl -lsubunit
+ifeq ($(UNAME_S),Darwin)
+UNIT_LIBS=-lcheck -lm -lpthread
+endif
+
+unit:LDFLAGS+=$(UNIT_LIBS)
 build/test-evloop: $(OBJ) build/test/test_eventloop.o
 	@echo "[LD] $@"
 	@$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(BEGIN_GROUP) $(^) $(END_GROUP)