anchor.diff:  
   :missing
   echo Can't find Visual Studio 2015.
  -goto :eof+goto :eof
  
positive.code: echo Swtich to x86 build env
  cd luajit\src
  call msvcbuild.bat
  copy /Y lua51.dll ..\..\prebuilt\x86\slua.dll
  cd ..\..
  
  call "%ENV64%"
  echo Swtich to x64 build env
  cd luajit\src
  call msvcbuild.bat
  copy /Y lua51.dll ..\..\prebuilt\x64\slua.dll
  cd ..\..
  
  
  
negative.code: if exist "%VS140COMNTOOLS%" (
  	set VCVARS="%VS140COMNTOOLS%..\..\VC\bin\"
  	goto build
  	)
  else (goto missing)
  
  :build
  