  
  namespace gr {
  namespace fec {
+diff --git a/gr-fec/include/gnuradio/fec/ldpc_H_matrix.h b/gr-fec/include/gnuradio/fec/ldpc_H_matrix.h
+index 9a3628a52..b4c793f82 100644
+--- a/gr-fec/include/gnuradio/fec/ldpc_H_matrix.h
++++ b/gr-fec/include/gnuradio/fec/ldpc_H_matrix.h
+@@ -12,6 +12,7 @@
+ #include <gnuradio/fec/api.h>
+ #include <gnuradio/fec/fec_mtrx.h>
+ #include <memory>
++#include <string>
+ 
+ namespace gr {
+ namespace fec {
 diff --git a/gr-fec/lib/polar_common.cc b/gr-fec/lib/polar_common.cc
 index 6df894766..1b2a13137 100644
 --- a/gr-fec/lib/polar_common.cc

From 3d48d0df8de208dd106c6e5a34d80c5b77e1c308 Mon Sep 17 00:00:00 2001
From: Ryan Volz <ryan.volz@gmail.com>
Date: Tue, 15 Sep 2020 13:44:19 -0400
Subject: [PATCH] lib, include: Include missing headers.

This fixes compilation with MSVC on conda-forge, although why this
wasn't needed earlier is a mystery.
---
 gnuradio-runtime/lib/io_signature.cc               | 1 +
 gr-fec/include/gnuradio/fec/fec_mtrx.h             | 1 +
 gr-fec/include/gnuradio/fec/ldpc_G_matrix.h        | 1 +
 gr-fec/include/gnuradio/fec/ldpc_H_matrix.h        | 1 +
 gr-fec/lib/polar_common.cc                         | 1 +
 gr-fec/python/fec/bindings/fec_mtrx_python.cc      | 2 +-
 gr-fec/python/fec/bindings/ldpc_G_matrix_python.cc | 2 +-
 gr-fec/python/fec/bindings/ldpc_H_matrix_python.cc | 2 +-
 8 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/gnuradio-runtime/lib/io_signature.cc b/gnuradio-runtime/lib/io_signature.cc
index e5fd2bdd7..b330e56c3 100644
