From 6e39a67aecaa4ea6d92a7ace3670cec4a582c7c5 Mon Sep 17 00:00:00 2001
From: Luke Granger-Brown <git@lukegb.com>
Date: Sat, 28 Nov 2020 20:38:40 +0000
Subject: [PATCH] clickhouse: use system LLVM

Building LLVM pieces is a huge contributor to build times, and probably
bloats binary size as well. Fortunately, there's a knob for this
specific thing (-DUNBUNDLED=ON seems broken and requires some libraries
which aren't packaged for Nix at the moment).

Hopefully this will make clickhouse able to build on OfBorg.
---
 pkgs/servers/clickhouse/default.nix | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pkgs/servers/clickhouse/default.nix b/pkgs/servers/clickhouse/default.nix
index 4fd5b6c4751e..8bb7aafc3c5a 100644
--- a/pkgs/servers/clickhouse/default.nix
+++ b/pkgs/servers/clickhouse/default.nix
@@ -46,6 +46,7 @@ stdenv.mkDerivation rec {
 
   cmakeFlags = [
     "-DENABLE_TESTS=OFF"
+    "-DUSE_INTERNAL_LLVM_LIBRARY=OFF"
   ];
 
   postInstall = ''