From 625887e6df5dbebe48be172b424ba519e2ba2ddc Mon Sep 17 00:00:00 2001
From: Christopher Chavez <chrischavez@gmx.us>
Date: Fri, 19 May 2023 14:09:59 -0500
Subject: [PATCH] gh-103839: Allow building Tkinter against Tcl 8.7 without
 external libtommath (GH-103842)

---
 .../Library/2023-04-25-16-31-00.gh-issue-103839.tpyLhI.rst     | 2 ++
 Modules/_tkinter.c                                             | 3 +++
 2 files changed, 5 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Library/2023-04-25-16-31-00.gh-issue-103839.tpyLhI.rst

diff --git a/Misc/NEWS.d/next/Library/2023-04-25-16-31-00.gh-issue-103839.tpyLhI.rst b/Misc/NEWS.d/next/Library/2023-04-25-16-31-00.gh-issue-103839.tpyLhI.rst
new file mode 100644
index 00000000000000..1d40a8fbcd3f59
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2023-04-25-16-31-00.gh-issue-103839.tpyLhI.rst
@@ -0,0 +1,2 @@
+Avoid compilation error due to tommath.h not being found when building
+Tkinter against Tcl 8.7 built with bundled libtommath.
diff --git a/Modules/_tkinter.c b/Modules/_tkinter.c
index 4dada0b28f0559..49c94447c7237c 100644
--- a/Modules/_tkinter.c
+++ b/Modules/_tkinter.c
@@ -60,6 +60,9 @@ Copyright (C) 1994 Steen Lumholt.
 #error "Tk older than 8.5.12 not supported"
 #endif
 
+#ifndef TCL_WITH_EXTERNAL_TOMMATH
+#define TCL_NO_TOMMATH_H
+#endif
 #include <tclTomMath.h>
 
 #if !(defined(MS_WINDOWS) || defined(__CYGWIN__))