diff -burN cgit-0.8.1.orig/Makefile cgit-0.8.1/Makefile
--- cgit-0.8.1.orig/Makefile	2008-12-10 09:59:24.000000000 +0100
+++ cgit-0.8.1/Makefile	2008-12-11 00:02:15.000000000 +0100
@@ -86,13 +86,13 @@
 endif
 
 LDFLAGS ?=
-CFLAGS ?= -g -Wall
-CFLAGS += -Igit
-CFLAGS += -DSHA1_HEADER='$(SHA1_HEADER)'
-CFLAGS += -DCGIT_VERSION='"$(CGIT_VERSION)"'
-CFLAGS += -DCGIT_CONFIG='"$(CGIT_CONFIG)"'
-CFLAGS += -DCGIT_SCRIPT_NAME='"$(CGIT_SCRIPT_NAME)"'
-CFLAGS += -DCGIT_CACHE_ROOT='"$(CACHE_ROOT)"'
+override CFLAGS ?= -g -Wall
+override CFLAGS += -Igit
+override CFLAGS += -DSHA1_HEADER='$(SHA1_HEADER)'
+override CFLAGS += -DCGIT_VERSION='"$(CGIT_VERSION)"'
+override CFLAGS += -DCGIT_CONFIG='"$(CGIT_CONFIG)"'
+override CFLAGS += -DCGIT_SCRIPT_NAME='"$(CGIT_SCRIPT_NAME)"'
+override CFLAGS += -DCGIT_CACHE_ROOT='"$(CACHE_ROOT)"'
 
 ifeq ($(uname_O),Cygwin)
 	NO_STRCASESTR = YesPlease