From 91e96739542e9e91ce832648bbf2be24192e7d18 Mon Sep 17 00:00:00 2001
From: William Casarin <bill@casarin.me>
Date: Tue, 20 Oct 2015 07:28:03 -0700
Subject: [PATCH] lmdb: fix on OSX

---
 pkgs/development/libraries/lmdb/default.nix | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/pkgs/development/libraries/lmdb/default.nix b/pkgs/development/libraries/lmdb/default.nix
index 02c07a78acb..8621a573190 100644
--- a/pkgs/development/libraries/lmdb/default.nix
+++ b/pkgs/development/libraries/lmdb/default.nix
@@ -1,6 +1,7 @@
 { stdenv, fetchzip }:
 
-stdenv.mkDerivation rec {
+let optional = stdenv.lib.optional;
+in stdenv.mkDerivation rec {
   name = "lmdb-${version}";
   version = "0.9.16";
 
@@ -11,7 +12,8 @@ stdenv.mkDerivation rec {
 
   postUnpack = "sourceRoot=\${sourceRoot}/libraries/liblmdb";
 
-  makeFlags = "prefix=$(out)";
+  makeFlags = ["prefix=$(out)"]
+              ++ optional stdenv.cc.isClang "CC=clang";
 
   doCheck = true;
   checkPhase = "make test";