From e4d31bd6c5fb691f7cbac93ea6179668349288a6 Mon Sep 17 00:00:00 2001
From: Rafael Ieda <git@ieda.me>
Date: Sun, 2 Nov 2025 21:36:09 -0300
Subject: [PATCH] robodoc: fix build on darwin

---
 pkgs/by-name/ro/robodoc/package.nix | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/pkgs/by-name/ro/robodoc/package.nix b/pkgs/by-name/ro/robodoc/package.nix
index 4a8bb485a6f6..bfb50edaaf68 100644
--- a/pkgs/by-name/ro/robodoc/package.nix
+++ b/pkgs/by-name/ro/robodoc/package.nix
@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchFromGitHub,
+  fetchpatch,
   autoreconfHook,
 }:
 
@@ -16,6 +17,14 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-l3prSdaGhOvXmZfCPbsZJNocO7y20zJjLQpajRTJOqE=";
   };
 
+  patches = [
+    (fetchpatch {
+      name = "troff_generator-fix";
+      url = "https://github.com/gumpu/ROBODoc/commit/0f8b35c42523810415bec70bb2200d2ecb41c82f.patch?index=full";
+      hash = "sha256-Pbuc1gHrOeHbR4QT/dZ8wP+vqYQlilayjCGKOJP5wvk=";
+    })
+  ];
+
   postConfigure = lib.optionalString stdenv.hostPlatform.isDarwin ''
     substituteInPlace Docs/makefile.am \
       --replace 'man1_MANS = robodoc.1 robohdrs.1' 'man1_MANS ='