Patch the required version back to 2.59
We'll include the missing macros via acinclude.m4

--- ndisc6-0.6.7/configure.ac~	2006-08-14 16:46:06.000000000 +1000
+++ ndisc6-0.6.7/configure.ac	2006-08-14 16:46:06.000000000 +1000
@@ -21,7 +21,7 @@
 
 AC_COPYRIGHT([Copyright (C) 2005-2006 Remi Denis-Courmont])
 AC_INIT(ndisc6, 0.6.7, rdenis@simphalempin.com)
-AC_PREREQ(2.59c)
+AC_PREREQ(2.59)
 INVOCATION="$0 $*"
 
 AS_MESSAGE(checking system...)