anchor.diff:  cmake -DCMAKE_INSTALL_PREFIX=%ZLIB_INSTALL_DIR% ..
   if %ERRORLEVEL% neq 0 exit /b %ERRORLEVEL%
   
  -cmake --build . --target install
  +cmake --build . --config Release --target install
   if %ERRORLEVEL% neq 0 exit /b %ERRORLEVEL%
   
   pushd %BUILD_DIR%
   cmake %EXTRA_CMAKE_ARGS% %SOURCE_DIR%
   if %ERRORLEVEL% neq 0 exit /b %ERRORLEVEL%
   
  -cmake --build . --config Release
  +cmake --build . --config %BUILD_CONFIG%
   if %ERRORLEVEL% neq 0 exit /b %ERRORLEVEL%
  
positive.code: if %ERRORLEVEL% neq 0 exit /b %ERRORLEVEL%
  
  if EXIST %BUILD_DIR% rd /S /Q %BUILD_DIR%
  
  md %BUILD_DIR%
  pushd %BUILD_DIR%
  
negative.code: set "DIR=%~dp0"
  set "SOURCE_DIR=%DIR%\.."
  set "BUILD_DIR=%DIR%\Release"
  set "BUILD_CONFIG=Release"
  set "ZLIB_ZIP=%DIR%\zlib1211.zip"
  set "EXTRA_CMAKE_ARGS="
  
  :loop
  