anchor.diff:  
   if NOT DEFINED DevEnvDir call "%ProgramFiles(x86)%\\Microsoft Visual Studio 14.0\\vc\\bin\\vcvars32.bat"
   
  -IF [%UpdateChannel%] == [] goto:donechecking
  +IF [%UpdateChannel%] == [] goto:donecheckingdrivers
   
  -IF [%UpdateChannel%] == [None] goto:donechecking
  +IF [%UpdateChannel%] == [None] goto:donecheckingdrivers
   
  -IF [%UpdateChannel%] == [Test] goto:donechecking
  +IF [%UpdateChannel%] == [Test] goto:donecheckingdrivers
   
   :: don't bother with ci or checking out source, etc. for smoke2 build
   IF [%UpdateChannel%] == [Smoke2] goto:done_ci
  
positive.code: 
  goto:eof
  
  :build_error
  %OUTPUT% "Error building Windows"
  EXIT /B 1
  
negative.code: signtool verify /all /kp /v Win10_Sys | find "Issued to: Microsoft Windows Hardware Compatibility Publisher"
  IF %ERRORLEVEL% NEQ 0 goto:build_error || EXIT /B 1
  
  :donecheckingdrivers 
  
  call:checkout_keybase client, %ClientRevision% || goto:build_error || EXIT /B 1
  call:checkout_keybase kbfs, %KBFSRevision% || goto:build_error || EXIT /B 1
  