More cross compiling infrastructure.
diff --git a/Makefile b/Makefile
index dec52d8..9c724aa 100644
--- a/Makefile
+++ b/Makefile
@@ -1,12 +1,15 @@
 # Makefile for toybox.
 # Copyright 2006 Rob Landley <rob@landley.net>
 
-CFLAGS  = -Wall -Wundef -Wno-char-subscripts -Os
+CFLAGS  := $(CFLAGS) -Wall -Wundef -Wno-char-subscripts -Os
 CCFLAGS = $(CFLAGS) -funsigned-char
 CC      = $(CROSS_COMPILE)gcc
 STRIP   = $(CROSS_COMPILE)strip
 HOSTCC  = gcc
 
+# A synonym.
+CROSS_COMPILE = $(CROSS)
+
 all: toybox
 
 .PHONY: clean