anchor.diff:  :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%
  -call emcc src/olvm.c src/slim.c -o olvm.js -s ASYNCIFY=1 -Oz ^
  +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']"
  
positive.code: IF "%1"=="ol" GOTO OL
  IF "%1"=="ol32" GOTO OL32
  IF "%1"=="repl" GOTO REPL
  IF "%1"=="boot" GOTO BOOT
  IF "%1"=="slim" GOTO SLIM
  IF "%1"=="talkback" GOTO TALKBACK
  
negative.code: GOTO :REPL
  
  :REPL32
  set PATH=%MINGW32%;%PATH%
  ld -r -b binary -o src/repl32.o -m32 repl
  set PATH=%PATH~%
  GOTO:EOF
  
  :REPL64
  set PATH=%MINGW64%;%PATH%
  ld -r -b binary -o src/repl64.o -m32 repl
  set PATH=%PATH~%
  GOTO:EOF
  
  :SLIM
  