--- a/Makefile
+++ b/Makefile
@@ -1,13 +1,13 @@
-FLAGS = -O3 -DLOW_VERSION="\"`git show -s --format=%cd --date=format:%Y%m%d`_`git rev-parse --short HEAD`\""
+FLAGS = -DLOW_VERSION="\"$(LOW_VERSION)\"" -DLOW_LIB_PATH="\"$(LOW_LIB_PATH)\""
 
 C = gcc
-CFLAGS = $(FLAGS) -Isrc -Iapp -Ideps/duktape/src-low
+CFLAGS += $(FLAGS) -Isrc -Iapp -Ideps/duktape/src-low
 
 CXX = g++
-CXXFLAGS = $(FLAGS) -Isrc -Iapp -Ideps/duktape/src-low -Ideps/open62541/build/src_generated -Ideps/open62541/include -Ideps/open62541/arch -Ideps/open62541/plugins/include -Ideps/open62541/src/client -Ideps/open62541/deps -Ideps/open62541/src --std=c++11
+CXXFLAGS += $(FLAGS) -Isrc -Iapp -Ideps/duktape/src-low -Ideps/open62541/build/src_generated -Ideps/open62541/include -Ideps/open62541/arch -Ideps/open62541/plugins/include -Ideps/open62541/src/client -Ideps/open62541/deps -Ideps/open62541/src --std=c++11
 
 LD = g++
-LDFLAGS = $(FLAGS) -lm -ldl -lpthread -lcares -lmbedcrypto -lmbedtls -lmbedx509 deps/open62541/build/bin/libopen62541.a
+LDFLAGS += $(FLAGS) -lm -ldl -lpthread -lcares -lmbedcrypto -lmbedtls -lmbedx509 deps/open62541/build/bin/libopen62541.a
 
 OBJECTS_LOW =						\
 	app/main.o						\