make: Change configure to output ndn-cpp/ndn-cpp-config.h instead of config.h
diff --git a/configure.ac b/configure.ac
index 19bfb0f..9b3002a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3,7 +3,7 @@
 AM_INIT_AUTOMAKE([1.10 -Wall no-define foreign])
 
 AC_CONFIG_SRCDIR([config.h.in])
-AC_CONFIG_HEADERS([config.h])
+AC_CONFIG_HEADERS([ndn-cpp/ndn-cpp-config.h:config.h.in])
 AM_MAINTAINER_MODE
 AM_PROG_AR
 AC_PROG_LIBTOOL