Index: apps/build.tcl
===================================================================
diff -u -N -r5a80e290968c4a48ef91cf714f522edb8a75c6d5 -r0aae129621a59088bba8470cd7aef9ce2221c4b7
--- apps/build.tcl	(.../build.tcl)	(revision 5a80e290968c4a48ef91cf714f522edb8a75c6d5)
+++ apps/build.tcl	(.../build.tcl)	(revision 0aae129621a59088bba8470cd7aef9ce2221c4b7)
@@ -81,11 +81,6 @@
   switch -exact -- $TOOLCHAIN {
     autoconf-tea {
       set opts [list --libdir=$tclDir --enable-64bit]
-
-      # see https://core.tcl-lang.org/tips/doc/trunk/tip/538.md
-      if {$TCLTAG eq "core-8-branch"} {
-        lappend opts "--without-system-libtommath"
-      }
       
       exec >@stdout 2>@stderr bash -lc "./configure $opts"
       exec >@stdout 2>@stderr bash -lc "make"