$OpenBSD: patch-gr-digital_lib_protocol_formatter_async_impl_cc,v 1.1 2021/03/18 19:51:44 rsadowski Exp $

Build with newer Boost. From Fedora.

Index: gr-digital/lib/protocol_formatter_async_impl.cc
--- gr-digital/lib/protocol_formatter_async_impl.cc.orig
+++ gr-digital/lib/protocol_formatter_async_impl.cc
@@ -32,6 +32,8 @@
 namespace gr {
 namespace digital {
 
+using namespace boost::placeholders;
+
 protocol_formatter_async::sptr
 protocol_formatter_async::make(const header_format_base::sptr& format)
 {
