I created this ticket with the solution.

Tested on Windows 10 with Strawberry 5.32

--- encGlue.c.org       2020-09-01 17:34:14.514068300 +0200
+++ encGlue.c   2020-09-01 17:42:48.710327700 +0200
@@ -39,6 +39,9 @@
 #define NEED_PUSHSTACK_HACK
 #endif

+#undef  MAX
+#define MAX(a,b) ((a)>(b)?(a):(b))
+
 /* ------------------------------------------------------------------
+-------- */
 /* UTF8-ness routines
 /* ------------------------------------------------------------------
+-------- */
[download]

So, start cmd and:

C:> cd \Strawberry\cpan\build\Tk-804.035.0
C:\Strawberry\cpan\build\Tk-804.035.0> vim encGlue.c
-- make the above change
C:\Strawberry\cpan\build\Tk-804.035.0> gmake
C:\Strawberry\cpan\build\Tk-804.035.0> gmake test
C:\Strawberry\cpan\build\Tk-804.035.0> gmake install
[download]

Update 2020-09-08: This fix is queued for the next release of Tk.

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