diff -urN dnsmasq-2.41/CHANGELOG dnsmasq-2.42test1/CHANGELOG
--- dnsmasq-2.41/CHANGELOG	2008-02-11 05:48:46.000000000 -0600
+++ dnsmasq-2.42test1/CHANGELOG	2008-02-13 15:06:43.000000000 -0600
@@ -2462,6 +2462,9 @@
 	    when debug mode is set. Thanks to cedric Duval for the
 	    patch. 
 
+version 2.42 (backported fix)
+            Define __USE_GNU to avoid problems with later glibc
+            headers. Thanks to Jima for spotting the problem.
 
  
 
diff -urN dnsmasq-2.41/src/config.h dnsmasq-2.42test1/src/config.h
--- dnsmasq-2.41/src/config.h	2008-02-12 05:03:28.000000000 -0600
+++ dnsmasq-2.42test1/src/config.h	2008-02-13 15:07:05.000000000 -0600
@@ -85,13 +85,6 @@
 #endif
 
 
-/* Get linux C library versions. */
-#if defined(__linux__) && !defined(__UCLIBC__) && !defined(__uClinux__)
-/*#  include <libio.h> */
-#  include <features.h> 
-#endif
-
-
 /* Follows system specific switches. If you run on a 
    new system, you may want to edit these. 
    May replace this with Autoconf one day. 
diff -urN dnsmasq-2.41/src/dnsmasq.h dnsmasq-2.42test1/src/dnsmasq.h
--- dnsmasq-2.41/src/dnsmasq.h	2008-02-01 15:42:35.000000000 -0600
+++ dnsmasq-2.42test1/src/dnsmasq.h	2008-02-13 14:38:39.000000000 -0600
@@ -17,6 +17,17 @@
 #define COPYRIGHT "Copyright (C) 2000-2008 Simon Kelley" 
 
 /* get these before config.h  for IPv6 stuff... */
+/* Get linux C library versions. */
+#ifdef __linux__
+#  include <features.h> 
+#endif
+
+#ifdef __GLIBC__
+/* needed for in6_pktinfo on later glibc releases */
+#  define __USE_GNU
+#  define _GNU_SOURCE
+#endif
+
 #include <sys/types.h> 
 #include <netinet/in.h>