From 33c5f3cec7456a07ecfdab1a1fb05919701e1346 Mon Sep 17 00:00:00 2001
From: Benjamin Esham <benjamin@esham.io>
Date: Mon, 1 Jul 2019 13:13:22 -0400
Subject: [PATCH] olm: allow building on Darwin

---
 pkgs/development/libraries/olm/default.nix | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/libraries/olm/default.nix b/pkgs/development/libraries/olm/default.nix
index 4749efb5f00..49daff30e7b 100644
--- a/pkgs/development/libraries/olm/default.nix
+++ b/pkgs/development/libraries/olm/default.nix
@@ -8,7 +8,7 @@ stdenv.mkDerivation rec {
     description = "Implements double cryptographic ratchet and Megolm ratchet";
     license = stdenv.lib.licenses.asl20;
     homepage = https://matrix.org/git/olm/about;
-    platforms = stdenv.lib.platforms.linux;
+    platforms = with stdenv.lib.platforms; darwin ++ linux;
   };
 
   src = fetchurl {
@@ -22,5 +22,7 @@ stdenv.mkDerivation rec {
   # requires optimisation but memory operations are compiled with -O0
   hardeningDisable = ["fortify"];
 
+  makeFlags = if stdenv.cc.isClang then [ "CC=cc" ] else null;
+
   installFlags = "PREFIX=$(out)";
 }