1 files changed, 2 insertions, 2 deletions

diff --git a/config.mk b/config.mk
index aeb525f..364f8bc 100644
--- a/config.mk
+++ b/config.mk
@@ -1,8 +1,8 @@
 CXX ?= clang++
 CC ?= clang
 LDLIBS = -lm -lstdc++
-CFLAGS = -MD -O0 -ggdb -Wall -std=c99 -I/usr/local/include
-CXXFLAGS = -MD -O0 -ggdb -Wall -std=c++11 -I/usr/local/include
+CFLAGS += -MD -O0 -ggdb -Wall -std=c99 -I/usr/local/include
+CXXFLAGS += -MD -O0 -ggdb -Wall -std=c++11 -I/usr/local/include
 PKG_CONFIG ?= pkg-config
 DESTDIR ?=
 PREFIX ?= /usr/local