From 124a61f10d6c93440a9733b665ff6fdea2c90969 Mon Sep 17 00:00:00 2001
From: Michael Raskin <7c6f434c@mail.ru>
Date: Sun, 28 Jun 2015 13:41:27 +0300
Subject: [PATCH] Fix alternative samba configuration evaluations

---
 pkgs/servers/samba/4.x.nix | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/pkgs/servers/samba/4.x.nix b/pkgs/servers/samba/4.x.nix
index ab3aac54cdd..1d957a8ec60 100644
--- a/pkgs/servers/samba/4.x.nix
+++ b/pkgs/servers/samba/4.x.nix
@@ -61,11 +61,13 @@ stdenv.mkDerivation rec {
       "--enable-fhs"
       "--sysconfdir=/etc"
       "--localstatedir=/var"
-      "--bundled-libraries=${if enableKerberos && kerberos.implementation == "heimdal" then "NONE" else "com_err"}"
+      "--bundled-libraries=${if enableKerberos && kerberos != null &&
+        kerberos.implementation == "heimdal" then "NONE" else "com_err"}"
       "--private-libraries=NONE"
       "--builtin-libraries=replace"
     ]
-    ++ optional (enableKerberos && kerberos.implementation == "krb5") "--with-system-mitkrb5"
+    ++ optional (enableKerberos && kerberos != null &&
+      kerberos.implementation == "krb5") "--with-system-mitkrb5"
     ++ optional (!enableDomainController) "--without-ad-dc"
     ++ optionals (!enableLDAP) [ "--without-ldap" "--without-ads" ];