From 48f544d2e3f70b19c82fe02ac56190b8204c44af Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Fri, 8 Feb 2008 11:48:06 +0000
Subject: [PATCH] * Function optionals.

svn path=/nixpkgs/trunk/; revision=10553
---
 pkgs/lib/default.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkgs/lib/default.nix b/pkgs/lib/default.nix
index 2a8061d70bb..f6ce083d970 100644
--- a/pkgs/lib/default.nix
+++ b/pkgs/lib/default.nix
@@ -180,6 +180,10 @@ rec {
   # (e.g. `++ optional (system == "i686-linux") flashplayer').
   optional = cond: elem: if cond then [elem] else [];
 
+  
+  # Return a list or an empty list, dependening on a boolean value.
+  optionals = cond: elems: if cond then elems else [];
+  
 
   # Return a list of integers from `first' up to and including `last'.
   range = first: last: