I most humbly beg your pardons, Monks, for the delay in my reply. I did not think there would be more in this thread after I stated I had filed a bug report, so did not look here for several days. Then I had to get past the hopeless feeling I was out of my depth. Then I did this: in the Makefile in the pTk directory, I changed this line CCCDLFLAGS = -fPIC to this: CCCDLFLAGS = -fPIC -DNeedWidePrototypes=1. (I readily admit I do not know if this was correct perl Monk{hv}'s suggestion.) In the event, however, I got quite a ways further! I am now getting this error in compiling the tkCanvText.c file (with a few preceding lines for context):

  cc -c  -I..  -I. -Ibitmaps  -fwrapv -fno-strict-aliasing -pipe -fsta
+ck-protector-strong -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_
+OFFSET_BITS=64 -D_FORTIFY_SOURCE=2 -O2   -DVERSION=\"804.036\" -DXS_V
+ERSION=\"804.036\" -fPIC -DNeedWidePrototypes=1 "-I/home/giz/perl5/pe
+rlbrew/perls/perl-5.40.0/lib/5.40.0/x86_64-linux/CORE"    tkCanvPs.c
cc -c  -I..  -I. -Ibitmaps  -fwrapv -fno-strict-aliasing -pipe -fstack
+-protector-strong -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OF
+FSET_BITS=64 -D_FORTIFY_SOURCE=2 -O2   -DVERSION=\"804.036\" -DXS_VER
+SION=\"804.036\" -fPIC -DNeedWidePrototypes=1 "-I/home/giz/perl5/perl
+brew/perls/perl-5.40.0/lib/5.40.0/x86_64-linux/CORE"    tkCanvText.c
tkCanvText.c: In function ‘GetTextIndex’:
tkCanvText.c:1253:40: error: passing argument 2 of ‘TcldeclsVptr->V_Tc
+l_GetStringFromObj’ from incompatible pointer type [-Wincompatible-po
+inter-types]
 1253 |     string = Tcl_GetStringFromObj(obj, &length);
      |                                        ^~~~~~~
      |                                        |
      |                                        size_t * {aka long unsi
+gned int *}
tkCanvText.c:1253:40: note: expected ‘int *’ but argument is of type ‘
+size_t *’ {aka ‘long unsigned int *’}
make[1]: *** [Makefile:865: tkCanvText.o] Error 1
make[1]: Leaving directory '/home/giz/.cpanm/work/1719011242.11417/Tk-
+804.036/pTk'
make: *** [Makefile:1658: pTk/libpTk.a] Error 2
[giz@daisy Tk-804.036$
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If everybody hasn't lost patience with me and has further suggestions, I should be very appreciative. --Bob