From c90287a5fc5870b1f33f2a0259f7c95ab942c90d Mon Sep 17 00:00:00 2001
From: Moraxyc <i@qaq.li>
Date: Tue, 19 May 2026 01:34:52 +0800
Subject: [PATCH] wcslib: fix build on darwin

---
 pkgs/by-name/wc/wcslib/package.nix | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkgs/by-name/wc/wcslib/package.nix b/pkgs/by-name/wc/wcslib/package.nix
index 83e0a53bb5cb..a56265119a1f 100644
--- a/pkgs/by-name/wc/wcslib/package.nix
+++ b/pkgs/by-name/wc/wcslib/package.nix
@@ -14,6 +14,9 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-eS/gXAlURDOppOpUgPrNvsLabSgFgnW16QBqHyjFZGU=";
   };
 
+  # error: call to undeclared library function 'snprintf'
+  env.NIX_CFLAGS_COMPILE = lib.optionalString stdenv.hostPlatform.isDarwin "-include stdio.h";
+
   nativeBuildInputs = [ flex ];
 
   enableParallelBuilding = true;