diff -urN dnstracer-1.7.orig/Makefile.am dnstracer-1.7/Makefile.am
--- dnstracer-1.7.orig/Makefile.am	2003-02-14 11:04:03.000000000 +0100
+++ dnstracer-1.7/Makefile.am	2003-08-07 22:35:05.000000000 +0200
@@ -3,7 +3,7 @@
 man_MANS = dnstracer.8
 
 AM_CFLAGS=-Wall
-@NOIPV6_TRUE@AM_CFLAGS+=	-DNOIPV6
+@NOIPV6_TRUE@AM_CFLAGS =	-DNOIPV6
 
 dnstracer.8: dnstracer.pod
 	$(PERL2MAN_RULE)