From 5038924756ca156303d7fb1b265091bb133c7f74 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Stanis=C5=82aw=20Pitucha?= <stan.pitucha@envato.com>
Date: Sun, 5 Feb 2023 23:04:14 +1100
Subject: [PATCH] dia: fix darwin build

Patch PDF plugin to build correctly with clang.
---
 pkgs/applications/graphics/dia/default.nix | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkgs/applications/graphics/dia/default.nix b/pkgs/applications/graphics/dia/default.nix
index 6b75bf11d423..0adc585603ef 100644
--- a/pkgs/applications/graphics/dia/default.nix
+++ b/pkgs/applications/graphics/dia/default.nix
@@ -34,6 +34,9 @@ stdenv.mkDerivation {
 
   patches = [ ./poppler-22_09-build-fix.patch ];
 
+  # Required for the PDF plugin when building with clang.
+  CXXFLAGS = "-std=c++17";
+
   preConfigure = ''
     patchShebangs .
   '';