From b4b61822fa6a5b72d4a657e57e0d189581d0a3f4 Mon Sep 17 00:00:00 2001
From: Sizhe Zhao <prc.zhao@outlook.com>
Date: Thu, 6 Nov 2025 17:10:30 +0800
Subject: [PATCH] capypdf: fix build on darwin

---
 pkgs/by-name/ca/capypdf/package.nix | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pkgs/by-name/ca/capypdf/package.nix b/pkgs/by-name/ca/capypdf/package.nix
index 51f3a492ae3a..3ddff2102dc8 100644
--- a/pkgs/by-name/ca/capypdf/package.nix
+++ b/pkgs/by-name/ca/capypdf/package.nix
@@ -11,6 +11,7 @@
   libpng,
   libtiff,
   zlib,
+  darwinMinVersionHook,
 }:
 
 stdenv.mkDerivation (finalAttrs: {
@@ -42,7 +43,9 @@ stdenv.mkDerivation (finalAttrs: {
     libjpeg
     libtiff
     zlib
-  ];
+  ]
+  # error: 'to_chars' is unavailable: introduced in macOS 13.3
+  ++ lib.optional stdenv.hostPlatform.isDarwin (darwinMinVersionHook "13.3");
 
   meta = {
     description = "Fully color managed PDF generation library";