--- a/src/Makefile	2010-10-02 21:43:52.099078234 +0200
+++ b/src/Makefile	2010-10-02 23:46:44.197838553 +0200
@@ -6,8 +6,8 @@
 SDL_LIBS := $(shell sdl-config --libs)
 SDL_FLAGS := $(shell sdl-config --cflags)
 
-CFLAGS := $(CFLAGS) -Wall -fsigned-char -DWITH_KEYMAPPING
-LDFLAGS :=
+CFLAGS := $(CFLAGS) $(CPPFLAGS) -Wall -fsigned-char -DWITH_KEYMAPPING
+LDFLAGS := $(LDFLAGS)
 LIBS :=
 
 ifdef DEBUG
--- a/src/Makefile.unix	2010-10-02 21:43:38.669081686 +0200
+++ b/src/Makefile.unix	2010-10-02 21:43:47.457845197 +0200
@@ -1,2 +1,2 @@
-AR := ar
-CXX := g++
+AR ?= ar
+CXX ?= g++