From cf8cd83effe519c0bfc121cd4e3b62dc60cad3fa Mon Sep 17 00:00:00 2001
From: Mitsuhiro Nakamura <m.nacamura@gmail.com>
Date: Mon, 22 Jan 2018 23:06:35 +0900
Subject: [PATCH] cataclysm-dda: build the icon only on Darwin

---
 pkgs/games/cataclysm-dda/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/games/cataclysm-dda/default.nix b/pkgs/games/cataclysm-dda/default.nix
index 6ab2b4449b92..550d557e57ef 100644
--- a/pkgs/games/cataclysm-dda/default.nix
+++ b/pkgs/games/cataclysm-dda/default.nix
@@ -37,7 +37,7 @@ stdenv.mkDerivation rec {
     "OSX_MIN=10.6"  # SDL for macOS only supports deploying on 10.6 and above
   ];
 
-  postBuild = ''
+  postBuild = stdenv.lib.optionalString stdenv.isDarwin ''
     # iconutil on macOS is not available in nixpkgs
     png2icns data/osx/AppIcon.icns data/osx/AppIcon.iconset/*
   '';