From db38226bb3f88b0afa5568efaf8972bb823965c6 Mon Sep 17 00:00:00 2001
From: Chris Kuethe <chris.kuethe+github@gmail.com>
Date: Sat, 16 Oct 2021 11:59:57 -0700
Subject: [PATCH] add mutex header

---
 src/keogram.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/keogram.cpp b/src/keogram.cpp
index c80ad1d0e..dc4152680 100644
--- a/src/keogram.cpp
+++ b/src/keogram.cpp
@@ -14,6 +14,7 @@ using namespace std;
 #include <sys/time.h>
 #include <cstdlib>
 #include <iostream>
+#include <mutex>
 #include <string>
 #include <thread>
 #include <vector>