From df66ff14b49f4388625212f6bc86b754cb51d4eb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?B=C3=A9n=C3=A9dikt=20Tran?=
 <10796600+picnixz@users.noreply.github.com>
Date: Mon, 20 Jan 2025 14:27:14 +0100
Subject: gh-128978: Fix a `NameError` in `sysconfig.expand_makefile_vars`
 (#128979)

This fixes a regression introduced by 4a53a397c311567f05553bc25a28aebaba4f6f65.
---
 Lib/sysconfig/__init__.py                                              | 3 +++
 .../NEWS.d/next/Library/2025-01-18-11-04-44.gh-issue-128978.hwg7-w.rst | 2 ++
 2 files changed, 5 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Library/2025-01-18-11-04-44.gh-issue-128978.hwg7-w.rst

diff --git a/Lib/sysconfig/__init__.py b/Lib/sysconfig/__init__.py
index 7a4a8f6..ec9bb70 100644
--- a/Lib/sysconfig/__init__.py
+++ b/Lib/sysconfig/__init__.py
@@ -718,6 +718,9 @@ def expand_makefile_vars(s, vars):
     """
     import re
 
+    _findvar1_rx = r"\$\(([A-Za-z][A-Za-z0-9_]*)\)"
+    _findvar2_rx = r"\${([A-Za-z][A-Za-z0-9_]*)}"
+
     # This algorithm does multiple expansion, so if vars['foo'] contains
     # "${bar}", it will expand ${foo} to ${bar}, and then expand
     # ${bar}... and so forth.  This is fine as long as 'vars' comes from
diff --git a/Misc/NEWS.d/next/Library/2025-01-18-11-04-44.gh-issue-128978.hwg7-w.rst b/Misc/NEWS.d/next/Library/2025-01-18-11-04-44.gh-issue-128978.hwg7-w.rst
new file mode 100644
index 0000000..521496d
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-01-18-11-04-44.gh-issue-128978.hwg7-w.rst
@@ -0,0 +1,2 @@
+Fix a :exc:`NameError` in :func:`!sysconfig.expand_makefile_vars`. Patch by
+Bénédikt Tran.
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