--- a/gr-uhd/lib/usrp_block_impl.cc	2020-10-25 12:41:10.964291095 +0800
+++ b/gr-uhd/lib/usrp_block_impl.cc	2020-10-26 10:07:48.298343153 +0800
@@ -22,8 +22,10 @@
 
 #include "usrp_block_impl.h"
 #include <functional>
+#include <boost/bind/placeholders.hpp>
 
 using namespace gr::uhd;
+using namespace boost::placeholders;
 
 const double usrp_block_impl::LOCK_TIMEOUT = 1.5;