From f3246ce6833660abe2cc599be31ba87ab7f3d41d Mon Sep 17 00:00:00 2001
From: Dmitry Kalinkin <dmitry.kalinkin@gmail.com>
Date: Fri, 17 Dec 2021 21:23:52 -0500
Subject: [PATCH] caf: fix darwin build

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

diff --git a/pkgs/development/libraries/caf/default.nix b/pkgs/development/libraries/caf/default.nix
index 045595a84fde..71db183afc60 100644
--- a/pkgs/development/libraries/caf/default.nix
+++ b/pkgs/development/libraries/caf/default.nix
@@ -26,6 +26,9 @@ stdenv.mkDerivation rec {
     export DYLD_LIBRARY_PATH=$PWD/libcaf_core:$PWD/libcaf_io
   '';
 
+  # error: 'get< ... >' is unavailable: introduced in macOS 10.13
+  CXXFLAGS = lib.optional (stdenv.hostPlatform.system == "x86_64-darwin") "-D_LIBCPP_DISABLE_AVAILABILITY";
+
   meta = with lib; {
     description = "An open source implementation of the actor model in C++";
     homepage = "http://actor-framework.org/";