--- a/src/Makefile	2015-09-22 03:47:13.777305599 +0200
+++ b/src/Makefile	2015-09-22 03:48:24.565303557 +0200
@@ -12,7 +12,7 @@
 SDL_FLAGS := $(shell sdl-config --cflags)
 endif
 
-CFLAGS := $(CFLAGS) -Wall -fsigned-char
+CFLAGS := $(CFLAGS) $(CPPFLAGS) -Wall -fsigned-char
 LDFLAGS := $(LDFLAGS)
 LIBS :=
 
--- a/src/Makefile.all	2015-09-22 03:49:00.833302511 +0200
+++ b/src/Makefile.all	2015-09-22 03:49:12.929302162 +0200
@@ -1,4 +1,4 @@
-AR := ar
+AR ?= ar
 
 ifndef CXX
 CXX := g++