From 5a21714e143ef4403fbe9d2e92151581de81eab8 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 19 Feb 2024 15:01:32 +0200
Subject: [PATCH] Add note on not supporting CMake ${VAR} style substitutions
 (GH issue 63)

---
 README.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index a214738..d0220db 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,8 @@ GNU Autoconf emulation build system module for `build2`.
 Specifically, this module provides an [`in`][module-in]-based rule for
 processing `config.h.in` files. Besides the Autoconf special line flavor
 (`#undef`), it also supports the CMake (`#cmakedefine`, `#cmakedefine01`) and
-Meson (`#mesondefine`) variants.
+Meson (`#mesondefine`) variants. Note that the CMake `${VAR}` style
+substitutions are not supported, only the `@VAR@` style.
 
 Similar to Autoconf, this module provides built-in support for a number of
 common `HAVE_*` configuration options. However, the values of these options