diff -Nurp make-dfsg-3.81/debian/common/copt.mk make-dfsg-3.81-new/debian/common/copt.mk
--- make-dfsg-3.81/debian/common/copt.mk	2008-07-28 03:41:30.000000000 +0100
+++ make-dfsg-3.81-new/debian/common/copt.mk	2008-07-28 04:00:22.000000000 +0100
@@ -16,11 +16,10 @@
 ###############################################################################
 
 CC = cc
-CFLAGS = -O2
 PREFIX    := /usr
 
 # Policy 10.1 says to make this the default
-CFLAGS += -g
+CFLAGS:=-g $(filter-out -g,$(CFLAGS)) # Don't say it twice.
 
 ## ifneq (,$(findstring debug,$(DEB_BUILD_OPTIONS)))
 ## endif