cd C:\WinPython27\relax_disp
"C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\bin\vcvars32.bat" "C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\vcvarsall .bat" x86"
scons
(Scons will automatically find CL.exe, and setup compilation for 64 bit.)