Install msys from http://sourceforge.net/projects/mingwbuilds/files/external-binary-packages/

Note this is only msys, not msys+mingw since we are not using gcc Uncompress into (e.g.) c:msys

Notes:

• Use forward / in paths to configure
• At the moment, Tcl only builds in the TCLSRC/win and TKSRC/win directories
• If doing 64-bit builds, add --enable-64bit

Use "Developer Command Prompt" from MSVC, not msys sh. For ./configure to run, you need to add c:MinGWMSYS1.0bin to your path:

set PATH=%PATH%;C:\MinGW\MSYS\1.0\bin
set CC=cl.exe
cd PATH_TO_TCLSRC\win
sh configure  --prefix=TCL_INSTALL_DIR --enable-threads 
make
make install
cd PATH_TO_TKSRC\win
sh configure  --prefix=TCL_INSTALL_DIR --enable-threads 
make
make install