gh-103839: Allow building Tkinter against Tcl 8.7 without external li…

…btommath (GH-103842)
python · May 19, 2023 · 625887e · 625887e
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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
@@ -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
@@ -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__))