From 9b2bd7479f4376292fd66cee36fed4d12498f31c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@gnu.org>
Date: Sat, 19 Nov 2011 18:28:16 +0000
Subject: [PATCH] Shadow: Make Linux-PAM optional; allow cross-compilation.

svn path=/nixpkgs/trunk/; revision=30482
---
 pkgs/os-specific/linux/shadow/default.nix | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/pkgs/os-specific/linux/shadow/default.nix b/pkgs/os-specific/linux/shadow/default.nix
index e4722f26d2b6..fec9fe3da611 100644
--- a/pkgs/os-specific/linux/shadow/default.nix
+++ b/pkgs/os-specific/linux/shadow/default.nix
@@ -1,22 +1,31 @@
-{ stdenv, fetchurl, pam, glibc }:
-   
+{ stdenv, fetchurl, pam ? null, glibcCross ? null }:
+
+let
+  glibc = if stdenv ? cross
+          then glibcCross
+          else stdenv.glibc;
+in
 stdenv.mkDerivation rec {
   name = "shadow-4.1.4.2";
-   
+
   src = fetchurl {
     url = "http://pkg-shadow.alioth.debian.org/releases/${name}.tar.bz2";
     sha256 = "1449ny7pdnwkavg92wvibapnkgdq5pas38nvl1m5xa37g5m7z64p";
   };
 
-  buildInputs = [ pam ];
+  buildInputs = stdenv.lib.optional (pam != null && stdenv.isLinux) pam;
 
   patches = [ ./no-sanitize-env.patch ./su-name.patch ./keep-path.patch ];
 
-  preBuild =
+  # Assume System V `setpgrp (void)', which is the default on GNU variants
+  # (`AC_FUNC_SETPGRP' is not cross-compilation capable.)
+  preConfigure = "export ac_cv_func_setpgrp_void=yes";
+
+  preBuild = assert glibc != null;
     ''
       substituteInPlace lib/nscd.c --replace /usr/sbin/nscd ${glibc}/sbin/nscd
     '';
-  
+
   meta = {
     homepage = http://pkg-shadow.alioth.debian.org/;
     description = "Suite containing authentication-related tools such as passwd and su";