--- test/base/Makefile.orig	2020-08-04 05:58:52 UTC
+++ test/base/Makefile
@@ -28,7 +28,7 @@ SRCDIR  := src
 BINDIR  := bin
 EXEC    := $(BINDIR)/server $(BINDIR)/client
 CC      ?= clang
-CFLAGS  := -O3 -Wall #-fPIC
+CFLAGS  ?= -O3 -Wall #-fPIC
 
 all: $(EXEC)