From 0fd81de795bcc8d992830d050f5cd62c8de94a1d Mon Sep 17 00:00:00 2001
From: Thomas A Caswell <tcaswell@gmail.com>
Date: Wed, 23 Nov 2022 19:02:37 -0500
Subject: [PATCH] DOC: add note about enabling c++11 support for old gcc

Closes #24530

This will produce warnings, but will compile.
---
 doc/devel/dependencies.rst | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/doc/devel/dependencies.rst b/doc/devel/dependencies.rst
index 365c062364e2..6fdf5f152481 100644
--- a/doc/devel/dependencies.rst
+++ b/doc/devel/dependencies.rst
@@ -213,7 +213,8 @@ C++ compiler
 
 Matplotlib requires a C++ compiler that supports C++11.
 
-- `gcc 4.8.1 <https://gcc.gnu.org/projects/cxx-status.html#cxx11>`_ or higher
+- `gcc 4.8.1 <https://gcc.gnu.org/projects/cxx-status.html#cxx11>`_ or higher.  For gcc <6.5 you will
+  need to set ``$CFLAGS=-std=c++11`` to enable C++11 support.
 - `clang 3.3 <https://clang.llvm.org/cxx_status.html>`_ or higher
 - `Visual Studio 2015
   <https://docs.microsoft.com/en-us/cpp/overview/visual-cpp-language-conformance?view=msvc-140>`_