--- mtools/Makefile.orig	2011-12-09 19:28:17.000000000 +0100
+++ mtools/Makefile	2012-08-16 10:09:08.429505540 +0200
@@ -2,9 +2,8 @@
 MAKEDIR = $(topdir)/mk
 include $(MAKEDIR)/syslinux.mk
 
-OPTFLAGS = -g -Os
 INCLUDES = -I. -I.. -I../libfat -I../libinstaller
-CFLAGS	 = $(GCCWARN) -D_FILE_OFFSET_BITS=64 $(OPTFLAGS) $(INCLUDES)
+CFLAGS	+= $(GCCWARN) -D_FILE_OFFSET_BITS=64 $(OPTFLAGS) $(INCLUDES)
 LDFLAGS	 = 
 
 SRCS     = syslinux.c \