diff --git a/TODO b/TODO
index 72ab6949..29a93dc6 100644
--- a/TODO
+++ b/TODO
@@ -7,10 +7,6 @@ Core
 
 - krt: rescan interfaces when route addition fails?
 
-- tagging of external routes?
-
-- configure: IPv6 on glibc 2.0?
-
 - Makefile: install target?
 
 - forgetting device routes???
diff --git a/sysdep/linux/sysio.h b/sysdep/linux/sysio.h
index 0e8ee3dd..32bec160 100644
--- a/sysdep/linux/sysio.h
+++ b/sysdep/linux/sysio.h
@@ -8,8 +8,10 @@
 
 #ifdef IPV6
 
-#ifdef CONFIG_IPV6_GLIBC_20
+#ifndef IPV6_UNICAST_HOPS
+/* Needed on glibc 2.0 systems */
 #include <linux/in6.h>
+#define CONFIG_IPV6_GLIBC_20
 #endif
 
 static inline void