--- ./makefile.unx.orig	2004-06-29 17:16:38.000000000 +0200
+++ ./makefile.unx	2013-11-10 15:12:37.000000000 +0100
@@ -5,9 +5,9 @@
 # windows MinGW makefile               #
 #--------------------------------------#
 
-CXX = g++
-CFLAGS = -Wall
-LDFLAGS = -s -lstdc++ `allegro-config --libs`
+CXX ?= g++
+CFLAGS += -Wall `allegro-config --cflags`
+LDFLAGS += -s -lstdc++ `allegro-config --libs`
 
 OBJECTS = main.o gui.o compute.o