anchor.diff:  @echo off
  +set PATH~=%PATH%
  +set MINGW32=C:\mingw\i686-6.2.0-posix-dwarf-rt_v5-rev1\mingw32\bin\
  +set MINGW64=C:\mingw-w64\x86_64-6.1.0-posix-seh-rt_v5-rev1\mingw64\bin\
  +
   echo -=( building %1 )=-------------------------------------------------------------------
   IF "%1"==""   GOTO ALL
   IF "%1"=="vm" GOTO VM
  
positive.code: 
  :TEST
  echo|set /p=Testing %1 ...
  ol.exe %1 >C:\TEMP\out
  fc C:\TEMP\out %1.ok > nul
  if errorlevel 1 goto fail1
  echo. Ok.
  GOTO:EOF
  :fail1
  
negative.code: :JS
  echo.   *** Making virtual machine on js:
  @set PATH=C:\Program Files\Emscripten\python\2.7.5.3_64bit\;C:\Program Files\Emscripten\emscripten\1.35.0\;%PATH%
  ol src/to-c.scm >src/repl.c
  call emcc src/olvm.c src/repl.c -o olvm.js -s ASYNCIFY=1 -Oz ^
       -s NO_EXIT_RUNTIME=1 ^
       -fno-exceptions -fno-rtti ^
       --memory-init-file 0 --llvm-opts "['-O3']"
  