From b84c74b3300bd98744dfa2e0ca276d39b4bb27c3 Mon Sep 17 00:00:00 2001
From: Mateusz Pusz <mateusz.pusz@gmail.com>
Date: Mon, 4 Sep 2023 11:11:55 +0200
Subject: [PATCH] fix: `fmt.h` did not have header guards for ODR

---
 src/core-fmt/include/mp-units/bits/fmt.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/core-fmt/include/mp-units/bits/fmt.h b/src/core-fmt/include/mp-units/bits/fmt.h
index 559c720c..95ef4549 100644
--- a/src/core-fmt/include/mp-units/bits/fmt.h
+++ b/src/core-fmt/include/mp-units/bits/fmt.h
@@ -27,6 +27,8 @@
 //
 // For the license information refer to format.h.
 
+#pragma once
+
 #include <gsl/gsl-lite.hpp>
 #include <mp-units/bits/fmt_hacks.h>
 #include <concepts>