From 2dd40bf1584d0aefd0d9b0157382580e0beab799 Mon Sep 17 00:00:00 2001
From: Will Dietz <w@wdtz.org>
Date: Wed, 20 Nov 2019 00:32:39 -0600
Subject: [PATCH] txr: add include to fix w/musl

---
 pkgs/tools/misc/txr/default.nix | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pkgs/tools/misc/txr/default.nix b/pkgs/tools/misc/txr/default.nix
index 0700b1b3898b..0f68ca82ece8 100644
--- a/pkgs/tools/misc/txr/default.nix
+++ b/pkgs/tools/misc/txr/default.nix
@@ -12,6 +12,11 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ bison flex ];
   buildInputs = [ libffi ];
 
+  # fix usage of off_t without include
+  postPatch = ''
+    sed -i '1i#include <sys/types.h>' sysif.h
+  '';
+
   enableParallelBuilding = true;
 
   doCheck = true;