From 9da5420213841bc6ed052a4568061e83b0377335 Mon Sep 17 00:00:00 2001
From: Robin Gloster <mail@glob.in>
Date: Sat, 26 Oct 2019 15:35:48 +0200
Subject: [PATCH] zeromq: *Flags are lists

---
 pkgs/development/libraries/zeromq/4.x.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/development/libraries/zeromq/4.x.nix b/pkgs/development/libraries/zeromq/4.x.nix
index db5d90e2f021..1a8f07a3ae0e 100644
--- a/pkgs/development/libraries/zeromq/4.x.nix
+++ b/pkgs/development/libraries/zeromq/4.x.nix
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
 
   doCheck = false; # fails all the tests (ctest)
 
-  cmakeFlags = if enableDrafts then [ "-DENABLE_DRAFTS=ON" ] else null;
+  cmakeFlags = stdenv.lib.optional enableDrafts "-DENABLE_DRAFTS=ON";
 
   meta = with stdenv.lib; {
     branch = "4";