Build with newer Boost. From Fedora.

Index: gr-digital/lib/header_payload_demux_impl.cc
--- gr-digital/lib/header_payload_demux_impl.cc.orig
+++ gr-digital/lib/header_payload_demux_impl.cc
@@ -31,6 +31,8 @@
 namespace gr {
 namespace digital {
 
+using namespace boost::placeholders;
+
 const pmt::pmt_t header_payload_demux_impl::msg_port_id()
 {
     static const pmt::pmt_t msg_port_id = pmt::mp("header_data");
