From b7cfaf5519bd275ace3f0f7268638522da9fdfc8 Mon Sep 17 00:00:00 2001
From: Robin Gloster <mail@glob.in>
Date: Sat, 26 Oct 2019 17:39:27 +0200
Subject: [PATCH] libmpeg2: *Flags are lists

---
 pkgs/development/libraries/libmpeg2/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/development/libraries/libmpeg2/default.nix b/pkgs/development/libraries/libmpeg2/default.nix
index 321204a0c4fd..2351ce2b5549 100644
--- a/pkgs/development/libraries/libmpeg2/default.nix
+++ b/pkgs/development/libraries/libmpeg2/default.nix
@@ -10,7 +10,7 @@ stdenv.mkDerivation rec {
   };
 
   # Otherwise clang fails with 'duplicate symbol ___sputc'
-  buildFlags = stdenv.lib.optionalString stdenv.isDarwin "CFLAGS=-std=gnu89";
+  buildFlags = stdenv.lib.optional stdenv.isDarwin "CFLAGS=-std=gnu89";
 
   meta = {
     homepage = http://libmpeg2.sourceforge.net/;