From d0bf496f7f61c79b042476800076d8c2146a54b2 Mon Sep 17 00:00:00 2001
From: Jan Tojnar <jtojnar@gmail.com>
Date: Wed, 14 Mar 2018 14:08:21 +0100
Subject: [PATCH] gnome3.vala: fix darwin build

---
 pkgs/development/compilers/vala/default.nix | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pkgs/development/compilers/vala/default.nix b/pkgs/development/compilers/vala/default.nix
index 83444b53f19..6a020e11a4b 100644
--- a/pkgs/development/compilers/vala/default.nix
+++ b/pkgs/development/compilers/vala/default.nix
@@ -77,6 +77,7 @@ in rec {
     major   = "0.40";
     minor   = "0";
     sha256  = "0wcfljl55a9qvslfcc4sf76wdpwgn83n96b7fgb7r49ib35qz20m";
+    extraNativeBuildInputs = stdenv.lib.optionals stdenv.isDarwin [ expat ];
     extraBuildInputs = [ graphviz ];
   };