From 5e9b49dd539cbf8f8f39d27cfa07db4dd099fb00 Mon Sep 17 00:00:00 2001
From: Tobias Geerinckx-Rice <tobias.geerinckx.rice@gmail.com>
Date: Mon, 11 Jan 2016 17:20:40 +0100
Subject: [PATCH] xdelta: add lzmaSupport; enable by default

---
 pkgs/tools/compression/xdelta/default.nix | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/pkgs/tools/compression/xdelta/default.nix b/pkgs/tools/compression/xdelta/default.nix
index d490d92e7d13..54e04d303d66 100644
--- a/pkgs/tools/compression/xdelta/default.nix
+++ b/pkgs/tools/compression/xdelta/default.nix
@@ -1,7 +1,15 @@
-{ stdenv, fetchFromGitHub, autoreconfHook }:
+{ stdenv, fetchFromGitHub, autoreconfHook
+, lzmaSupport ? true, xz ? null
+}:
 
-let version = "3.0.11"; in
-stdenv.mkDerivation {
+assert lzmaSupport -> xz != null;
+
+let
+  version = "3.0.11";
+  mkWith = flag: name: if flag
+    then "--with-${name}"
+    else "--without-${name}";
+in stdenv.mkDerivation {
   name = "xdelta-${version}";
   
   src = fetchFromGitHub {
@@ -12,11 +20,17 @@ stdenv.mkDerivation {
   };
 
   nativeBuildInputs = [ autoreconfHook ];
+  buildInputs = []
+    ++ stdenv.lib.optionals lzmaSupport [ xz ];
 
   postPatch = ''
     cd xdelta3
   '';
 
+  configureFlags = [
+    (mkWith lzmaSupport "liblzma")
+  ];
+
   enableParallelBuilding = true;
 
   doCheck = true;