+Index: wide-dhcpv6-20080615/common.c
+===================================================================
+--- wide-dhcpv6-20080615.orig/common.c 2010-11-02 22:07:03.161000001 +0100
++++ wide-dhcpv6-20080615/common.c 2010-11-02 22:07:19.532000002 +0100
+@@ -3207,7 +3207,7 @@
+ }
+
+ void
+-dprintf(int level, const char *fname, const char *fmt, ...)
++my_dprintf(int level, const char *fname, const char *fmt, ...)
+ {
+ va_list ap;
+ char logbuf[LINE_MAX];
+Index: wide-dhcpv6-20080615/Makefile.in
+===================================================================
+--- wide-dhcpv6-20080615.orig/Makefile.in 2010-11-02 22:07:03.151000001 +0100
++++ wide-dhcpv6-20080615/Makefile.in 2010-11-02 22:07:19.533000002 +0100
+@@ -37,7 +37,7 @@
+ group= @group@
+
+ CFLAGS= @CFLAGS@ @DEFS@ -DSYSCONFDIR=\"${sysconfdir}\" \
+- -DLOCALDBDIR=\"${localdbdir}\"
++ -DLOCALDBDIR=\"${localdbdir}\" $(EXTRA_CFLAGS)
+ LDFLAGS=@LDFLAGS@
+ LIBOBJS=@LIBOBJS@
+ LIBS= @LIBS@ @LEXLIB@
+Index: wide-dhcpv6-20080615/common.h
+===================================================================
+--- wide-dhcpv6-20080615.orig/common.h 2010-11-02 22:07:23.187000002 +0100
++++ wide-dhcpv6-20080615/common.h 2010-11-02 22:08:43.646001043 +0100
+@@ -155,7 +155,6 @@
+ extern int in6_addrscopebyif __P((struct in6_addr *, char *));
+ extern int in6_scope __P((struct in6_addr *));
+ extern void setloglevel __P((int));
+-extern void dprintf __P((int, const char *, const char *, ...));
+ extern int get_duid __P((char *, struct duid *));
+ extern void dhcp6_init_options __P((struct dhcp6_optinfo *));
+ extern void dhcp6_clear_options __P((struct dhcp6_optinfo *));
+Index: wide-dhcpv6-20080615/debug.h
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ wide-dhcpv6-20080615/debug.h 2010-11-02 22:14:58.354999418 +0100
+@@ -0,0 +1,13 @@
++#ifndef MY_DEBUG_H_
++#define MY_DEBUG_H_
++
++/* First include stdio.h, which may contain the prototype for the external dprintf.
++ * We do not want that. We redefine dprintf to our local implementation. */
++#include <stdio.h>
++#define dprintf my_dprintf
++#ifndef __P
++# define __P(x) x
++#endif
++extern void my_dprintf __P((int, const char *, const char *, ...));
++
++#endif /* MY_DEBUG_H_ */