From 9bcb35b30b882708d80ec84d52f8ee159df5ea85 Mon Sep 17 00:00:00 2001
From: Peter Ludemann <peter.ludemann@gmail.com>
Date: Sat, 21 Sep 2024 14:56:39 -0700
Subject: [PATCH] Xref C++ version of simple example

---
 man/foreign.doc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/man/foreign.doc b/man/foreign.doc
index 4f910fec92..190fe25c45 100644
--- a/man/foreign.doc
+++ b/man/foreign.doc
@@ -5265,7 +5265,9 @@ C compiler.
 
 The following is a very simple example going through all the steps
 outlined above. It provides an arithmetic expression evaluator. We will
-call the application \program{calc} and define it in the files \file{calc.c}
+call the application \program{calc} and define it in the files
+\file{calc.c}\footnote{A similar C++ program is in
+\href{https://www.swi-prolog.org/pldoc/man?section=cpp2}{C++ interface to SWI-Prolog (Version 2)}.}
 and \file{calc.pl}.  The Prolog file is simple:
 
 \begin{code}