set TCLINSTALL=\path\to\tcl\dir

2a) Unzip distribution to %BUILDDIR%

2b) Start BASH shell (MinGW62 Git shell)

cd %BUILDDIR%
./gen_dh_params > dh_params.h

od -A n -v -t xC < 'library/tls.tcl' > tls.tcl.h.new.1
sed 's@[^0-9A-Fa-f]@@g;s@..@0x&, @g' < tls.tcl.h.new.1 > generic/tls.tcl.h
rm -f tls.tcl.h.new.1

2c) Start Visual Studio shell

cd %BUILDDIR%\win