From de4df1e90bab8079de78e0bb51170a56b42f5084 Mon Sep 17 00:00:00 2001
From: Robert Hensing <robert@roberthensing.nl>
Date: Tue, 2 Dec 2025 02:38:08 +0100
Subject: [PATCH] maint: Fix lowdown override compatibility with newer nixpkgs

Use `or ""` fallback for postInstall attribute which may not exist in
newer nixpkgs versions of lowdown.

(cherry picked from commit 0aef1ddb9ee5b706be03e4956af9300fdbed4a97)
---
 packaging/dependencies.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packaging/dependencies.nix b/packaging/dependencies.nix
index 7f815f128..30629464e 100644
--- a/packaging/dependencies.nix
+++ b/packaging/dependencies.nix
@@ -54,7 +54,7 @@ scope: {
     nativeBuildInputs = prevAttrs.nativeBuildInputs ++ [ pkgs.buildPackages.bmake ];
     postInstall =
       lib.replaceStrings [ "lowdown.so.1" "lowdown.1.dylib" ] [ "lowdown.so.2" "lowdown.2.dylib" ]
-        prevAttrs.postInstall;
+        (prevAttrs.postInstall or "");
   });
 
   # TODO: Remove this when https://github.com/NixOS/nixpkgs/pull/442682 is included in a stable release