diff -up xdelta3.0z/Makefile.cflags xdelta3.0z/Makefile
--- xdelta3.0z/Makefile.cflags	2010-08-03 03:53:02.000000000 +0200
+++ xdelta3.0z/Makefile	2010-10-11 15:03:13.655066068 +0200
@@ -56,6 +56,8 @@ WIXDIR = "/cygdrive/c/Program Files/wix2
 CFLAGS= -Wall -Wshadow -fno-builtin
 WFLAGS= -Wextra -Wsign-compare -Wconversion -Wextra -Wno-unused-parameter
 
+include config.mak
+
 # $Format: "REL=$Xdelta3Version$" $
 REL=3.0z
 
@@ -125,7 +127,7 @@ wix: xdelta3.wxs xdelta3.wxi readme.txt 
 	$(WIXDIR)/light.exe xdelta3.wixobj -out xdelta3.msi
 
 xdelta3: $(SOURCES)
-	$(CC) $(CFLAGS) -O3 xdelta3.c -lm -o xdelta3 \
+	$(CC) $(CFLAGS) xdelta3.c -lm -o xdelta3 \
 	      -DGENERIC_ENCODE_TABLES=0 \
 	      -DREGRESSION_TEST=1 \
 	      -DSECONDARY_DJW=1 \