From 4835813cb6718359e16e4ffcfeb538102b60823b Mon Sep 17 00:00:00 2001
From: Eric Seidel <gridaphobe@gmail.com>
Date: Sat, 14 Mar 2015 09:08:15 -0700
Subject: [PATCH] judy: clang doesnt know -fno-aggressive-loop-optimizations

---
 pkgs/development/libraries/judy/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/development/libraries/judy/default.nix b/pkgs/development/libraries/judy/default.nix
index 4bca61d5b14b..13b50286380f 100644
--- a/pkgs/development/libraries/judy/default.nix
+++ b/pkgs/development/libraries/judy/default.nix
@@ -10,7 +10,7 @@ stdenv.mkDerivation {
 
   # gcc 4.8 optimisations break judy.
   # http://sourceforge.net/p/judy/mailman/message/31995144/
-  preConfigure = ''
+  preConfigure = stdenv.lib.optionalString (stdenv.cc.cc.isGNU or false) ''
     configureFlagsArray+=("CFLAGS=-fno-strict-aliasing -fno-aggressive-loop-optimizations")
   '';