From a612f9a3068f256dff84083f11986cb3463ecb3b Mon Sep 17 00:00:00 2001
From: Emily <vcs@emily.moe>
Date: Tue, 5 Aug 2025 17:43:31 +0100
Subject: [PATCH] =?UTF-8?q?fmt=5F11:=20add=20upstream=20patch=20for=20libc?=
 =?UTF-8?q?++=20=E2=89=A5=2021?=
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---
 pkgs/development/libraries/fmt/default.nix | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pkgs/development/libraries/fmt/default.nix b/pkgs/development/libraries/fmt/default.nix
index b789956dfe56..ed928af31cb5 100644
--- a/pkgs/development/libraries/fmt/default.nix
+++ b/pkgs/development/libraries/fmt/default.nix
@@ -89,5 +89,12 @@ in
   fmt_11 = generic {
     version = "11.2.0";
     hash = "sha256-sAlU5L/olxQUYcv8euVYWTTB8TrVeQgXLHtXy8IMEnU=";
+    patches = [
+      # Fixes the build with libc++ ≥ 21.
+      (fetchpatch {
+        url = "https://github.com/fmtlib/fmt/commit/3cabf3757b6bc00330b55975317b2c145e4c689d.patch";
+        hash = "sha256-SJFzNNC0Bt2aEQJlHGc0nv9KOpPQ+TgDX5iuFMUs9tk=";
+      })
+    ];
   };
 }