In common.h, define func_lib for function objects. In configure.ac, define HAVE_STD_FUNCTION and HAVE_BOOST_FUNCTION. Include function headers in ndnboost.
diff --git a/ndnboost/function/detail/maybe_include.hpp b/ndnboost/function/detail/maybe_include.hpp
new file mode 100644
index 0000000..a2f003e
--- /dev/null
+++ b/ndnboost/function/detail/maybe_include.hpp
@@ -0,0 +1,267 @@
+// Boost.Function library
+
+// Copyright Douglas Gregor 2003. Use, modification and
+// distribution is subject to the Boost Software License, Version
+// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// For more information, see http://www.boost.org
+
+#if BOOST_FUNCTION_NUM_ARGS == 0
+# ifndef BOOST_FUNCTION_0
+# define BOOST_FUNCTION_0
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 1
+# ifndef BOOST_FUNCTION_1
+# define BOOST_FUNCTION_1
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 2
+# ifndef BOOST_FUNCTION_2
+# define BOOST_FUNCTION_2
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 3
+# ifndef BOOST_FUNCTION_3
+# define BOOST_FUNCTION_3
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 4
+# ifndef BOOST_FUNCTION_4
+# define BOOST_FUNCTION_4
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 5
+# ifndef BOOST_FUNCTION_5
+# define BOOST_FUNCTION_5
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 6
+# ifndef BOOST_FUNCTION_6
+# define BOOST_FUNCTION_6
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 7
+# ifndef BOOST_FUNCTION_7
+# define BOOST_FUNCTION_7
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 8
+# ifndef BOOST_FUNCTION_8
+# define BOOST_FUNCTION_8
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 9
+# ifndef BOOST_FUNCTION_9
+# define BOOST_FUNCTION_9
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 10
+# ifndef BOOST_FUNCTION_10
+# define BOOST_FUNCTION_10
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 11
+# ifndef BOOST_FUNCTION_11
+# define BOOST_FUNCTION_11
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 12
+# ifndef BOOST_FUNCTION_12
+# define BOOST_FUNCTION_12
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 13
+# ifndef BOOST_FUNCTION_13
+# define BOOST_FUNCTION_13
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 14
+# ifndef BOOST_FUNCTION_14
+# define BOOST_FUNCTION_14
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 15
+# ifndef BOOST_FUNCTION_15
+# define BOOST_FUNCTION_15
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 16
+# ifndef BOOST_FUNCTION_16
+# define BOOST_FUNCTION_16
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 17
+# ifndef BOOST_FUNCTION_17
+# define BOOST_FUNCTION_17
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 18
+# ifndef BOOST_FUNCTION_18
+# define BOOST_FUNCTION_18
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 19
+# ifndef BOOST_FUNCTION_19
+# define BOOST_FUNCTION_19
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 20
+# ifndef BOOST_FUNCTION_20
+# define BOOST_FUNCTION_20
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 21
+# ifndef BOOST_FUNCTION_21
+# define BOOST_FUNCTION_21
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 22
+# ifndef BOOST_FUNCTION_22
+# define BOOST_FUNCTION_22
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 23
+# ifndef BOOST_FUNCTION_23
+# define BOOST_FUNCTION_23
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 24
+# ifndef BOOST_FUNCTION_24
+# define BOOST_FUNCTION_24
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 25
+# ifndef BOOST_FUNCTION_25
+# define BOOST_FUNCTION_25
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 26
+# ifndef BOOST_FUNCTION_26
+# define BOOST_FUNCTION_26
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 27
+# ifndef BOOST_FUNCTION_27
+# define BOOST_FUNCTION_27
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 28
+# ifndef BOOST_FUNCTION_28
+# define BOOST_FUNCTION_28
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 29
+# ifndef BOOST_FUNCTION_29
+# define BOOST_FUNCTION_29
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 30
+# ifndef BOOST_FUNCTION_30
+# define BOOST_FUNCTION_30
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 31
+# ifndef BOOST_FUNCTION_31
+# define BOOST_FUNCTION_31
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 32
+# ifndef BOOST_FUNCTION_32
+# define BOOST_FUNCTION_32
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 33
+# ifndef BOOST_FUNCTION_33
+# define BOOST_FUNCTION_33
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 34
+# ifndef BOOST_FUNCTION_34
+# define BOOST_FUNCTION_34
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 35
+# ifndef BOOST_FUNCTION_35
+# define BOOST_FUNCTION_35
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 36
+# ifndef BOOST_FUNCTION_36
+# define BOOST_FUNCTION_36
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 37
+# ifndef BOOST_FUNCTION_37
+# define BOOST_FUNCTION_37
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 38
+# ifndef BOOST_FUNCTION_38
+# define BOOST_FUNCTION_38
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 39
+# ifndef BOOST_FUNCTION_39
+# define BOOST_FUNCTION_39
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 40
+# ifndef BOOST_FUNCTION_40
+# define BOOST_FUNCTION_40
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 41
+# ifndef BOOST_FUNCTION_41
+# define BOOST_FUNCTION_41
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 42
+# ifndef BOOST_FUNCTION_42
+# define BOOST_FUNCTION_42
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 43
+# ifndef BOOST_FUNCTION_43
+# define BOOST_FUNCTION_43
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 44
+# ifndef BOOST_FUNCTION_44
+# define BOOST_FUNCTION_44
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 45
+# ifndef BOOST_FUNCTION_45
+# define BOOST_FUNCTION_45
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 46
+# ifndef BOOST_FUNCTION_46
+# define BOOST_FUNCTION_46
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 47
+# ifndef BOOST_FUNCTION_47
+# define BOOST_FUNCTION_47
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 48
+# ifndef BOOST_FUNCTION_48
+# define BOOST_FUNCTION_48
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 49
+# ifndef BOOST_FUNCTION_49
+# define BOOST_FUNCTION_49
+# include <ndnboost/function/function_template.hpp>
+# endif
+#elif BOOST_FUNCTION_NUM_ARGS == 50
+# ifndef BOOST_FUNCTION_50
+# define BOOST_FUNCTION_50
+# include <ndnboost/function/function_template.hpp>
+# endif
+#else
+# error Cannot handle Boost.Function objects that accept more than 50 arguments!
+#endif